AstroMedia 209.NST Petunjuk - Halaman 3

Jelajahi secara online atau unduh pdf Petunjuk untuk Teleskop AstroMedia 209.NST. AstroMedia 209.NST 5 halaman. The reflecting telescope

Halaman Cetak

tabs of the mirror holder sit on the eyepiece side of the main body and cover

the whole width of the face of the tube. The two foot tabs sit similarly on the

The head tabs of the mirror holder sit on the eyepiece side of the main body

tabs of the mirror holder sit on the eyepiece side of the main body and cover

opposite face. Push the mirror holder in until it is flush with the end of the

and cover the whole width of the face of the tube. The two foot tabs sit

the whole width of the face of the tube. The two foot tabs sit similarly on the

main body and secure the tabs with 4 paper clips.

similarly on the opposite face. Push the mirror holder in until it is ﬂush with

opposite face. Push the mirror holder in until it is flush with the end of the

Step 22 Now look through the eyepiece connector. Because of the dia-

the end of the main body and secure the tabs with 4 paper clips.

main body and secure the tabs with 4 paper clips.

phragms you should see a circular image through the other end of the tel-

Step 22 Now look through the eyepiece connector. Because of the

Step 22 Now look through the eyepiece connector. Because of the dia-

escope. This circular image should be in the middle of the secondary mirror.

diaphragms you should see a circular image through the other end of the

phragms you should see a circular image through the other end of the tel-

If the image is off to one side or the other, a slight pressure on the mirror in

tabs of the mirror holder sit on the eyepiece side of the main body and cover

telescope. This circular image should be in the middle of the secondary

escope. This circular image should be in the middle of the secondary mirror.

the other direction should be sufficient to correct this. Luckily cardboard is a

the whole width of the face of the tube. The two foot tabs sit similarly on the

mirror. If the image is off to one side or the other, a slight pressure on the

If the image is off to one side or the other, a slight pressure on the mirror in

very forgiving, error tolerant material... Do not stick the mirror holder in place

opposite face. Push the mirror holder in until it is flush with the end of the

mirror in the other direction should be sufﬁcient to correct this. Luckily

the other direction should be sufficient to correct this. Luckily cardboard is a

yet.

main body and secure the tabs with 4 paper clips.

cardboard is a very forgiving, error-tolerant material. Do not glue the mirror

very forgiving, error tolerant material... Do not stick the mirror holder in place

Step 22 Now look through the eyepiece connector. Because of the dia-

yet.

holder in place yet.

phragms you should see a circular image through the other end of the tel-

escope. This circular image should be in the middle of the secondary mirror.

If the image is off to one side or the other, a slight pressure on the mirror in

the other direction should be sufficient to correct this. Luckily cardboard is a

very forgiving, error tolerant material... Do not stick the mirror holder in place

yet.

The Main Mirror

The main mirror has 450mm focal length (abbreviated to "f" from the Latin

"focus"). That means it focuses parallel light to a point 450mm from its

The main mirror has a 450mm focal length (abbreviated to "f" from the Latin

The Main Mirror

surface. That would be about 28mm in front of the end of the main body if

focus ). That means it focuses parallel light to a point 450mm from its surface.

The main mirror has a 450mm focal length (abbreviated to "f" from the Latin

the secondary mirror had not diverted the light sideways into the eyepiece.

That would be about 28mm in front of the end of the main body if the second-

focus ). That means it focuses parallel light to a point 450mm from its surface.

The following steps should be done carefully and slowly. The front surface

ary mirror had not diverted the light sideways into the eyepiece. The follow-

That would be about 28mm in front of the end of the main body if the second-

The Main Mirror

ing steps should be done carefully and slowly. The front surface of the mirror

of the mirror is very susceptible to scratches and glue threads, despite the

ary mirror had not diverted the light sideways into the eyepiece. The follow-

is very susceptible to scratches and glue threads, despite the protective va-

protective vapour-deposited quartz layer on top of the aluminium.

The main mirror has a 450mm focal length (abbreviated to "f" from the Latin

ing steps should be done carefully and slowly. The front surface of the mirror

pour-deposited quartz layer on top of the aluminium.

Step 23 Fold the six tabs of the main mirror base plate [E1] to the back. At

focus ). That means it focuses parallel light to a point 450mm from its surface.

is very susceptible to scratches and glue threads, despite the protective va-

Step 23 Fold the six tabs of the main mirror base plate [E1]. to the back. At

the corners of each tab there are small handles. These are to facilitate

That would be about 28mm in front of the end of the main body if the second-

pour-deposited quartz layer on top of the aluminium.

the corners of each tab there are small handles. These are to facilitate ad-

adjustment of the mirror and are only cut off later after successful setup.

ary mirror had not diverted the light sideways into the eyepiece. The follow-

Step 23 Fold the six tabs of the main mirror base plate [E1]. to the back. At

justment of the mirror and are only cut-off later after successful set-up.

ing steps should be done carefully and slowly. The front surface of the mirror

Step 24 Fold the 36 small tabs of the main mirror holder [E2] to the front

the corners of each tab there are small handles. These are to facilitate ad-

Step 24 Fold the 36 small tabs of the main mirror holder [E2] to the front and

is very susceptible to scratches and glue threads, despite the protective va-

and make sure that the narrow hexagonal surround is not bent. Glue this

justment of the mirror and are only cut-off later after successful set-up.

make sure that the narrow hexagonal surround is not bent. Glue this hex-

pour-deposited quartz layer on top of the aluminium.

hexagonal surround centrally onto the base plate [E1]. The tabs should not

Step 24 Fold the 36 small tabs of the main mirror holder [E2] to the front and

Step 23 Fold the six tabs of the main mirror base plate [E1]. to the back. At

agonal surround centrally onto the base plate [E1]. The tabs should not have

have any glue on them. Press the piece ﬂat until dry.

make sure that the narrow hexagonal surround is not bent. Glue this hex-

the corners of each tab there are small handles. These are to facilitate ad-

any glue on them. Press the piece flat until dry.

Step 25 Fold the tabs completely up so they form a sort of round fence,

agonal surround centrally onto the base plate [E1]. The tabs should not have

justment of the mirror and are only cut-off later after successful set-up.

Step 25 Fold the tabs completely up so they form a sort of round fence,

apply glue to the inside edge as well as to the round inside of the base, and

any glue on them. Press the piece flat until dry.

Step 24 Fold the 36 small tabs of the main mirror holder [E2] to the front and

apply glue to the inside edge as well as to the round inside of the base, and

insert the main mirror with its ﬂat un-silvered side facing downwards. Only

make sure that the narrow hexagonal surround is not bent. Glue this hex-

Step 25 Fold the tabs completely up so they form a sort of round fence,

insert the main mirror with its flat unsilvered side down. Only hold the mirror

hold the mirror by its edges and donʼt touch the silvered surface. Apply a

agonal surround centrally onto the base plate [E1]. The tabs should not have

apply glue to the inside edge as well as to the round inside of the base, and

by its edges and don't touch the silvered surface. Apply a light tension with a

light tension with a rubber band around the ring of tabs so they are pressed

any glue on them. Press the piece flat until dry.

insert the main mirror with its flat unsilvered side down. Only hold the mirror

rubber band around the ring of tabs so they are pressed on evenly and lightly.

Step 25 Fold the tabs completely up so they form a sort of round fence,

on evenly and lightly. Put the whole assembly on a ﬂat surface and apply a

by its edges and don't touch the silvered surface. Apply a light tension with a

Put the whole assembly on a flat surface and apply a light pressure until dry.

apply glue to the inside edge as well as to the round inside of the base, and

light pressure until dry. Put a cloth between the mirror and any weight. It is

rubber band around the ring of tabs so they are pressed on evenly and lightly.

Put a cloth between the mirror and any weight. It is important that the mirror

insert the main mirror with its flat unsilvered side down. Only hold the mirror

important that the mirror lies ﬂat and even on the card. Allow to dry

Put the whole assembly on a flat surface and apply a light pressure until dry.

lies flat and even on the card. Allow to dry completely before moving it.

by its edges and don't touch the silvered surface. Apply a light tension with a

completely before moving it. Small amounts of adhesive at the edge of

Put a cloth between the mirror and any weight. It is important that the mirror

Small amounts of adhesive at the edge of the mirror do not affect the optics

rubber band around the ring of tabs so they are pressed on evenly and lightly.

the mirror do not affect the optics as a 5mm band around the edge is not

lies flat and even on the card. Allow to dry completely before moving it.

as a 5mm band around the edge is not used optically.

Put the whole assembly on a flat surface and apply a light pressure until dry.

used optically.

Small amounts of adhesive at the edge of the mirror do not affect the optics

Step26 It is necessary for the adjustment to draw a small cross exactly in

Put a cloth between the mirror and any weight. It is important that the mirror

as a 5mm band around the edge is not used optically.

Step 26 It is necessary for the adjustment to draw a small cross exactly in

the middle of the main mirror. The optical quality does not suffer because of

lies flat and even on the card. Allow to dry completely before moving it.

Step26 It is necessary for the adjustment to draw a small cross exactly in

the middle of the main mirror. The optical quality does not suffer because of

this mark because the secondary mirror keeps the light from falling onto the

Small amounts of adhesive at the edge of the mirror do not affect the optics

the middle of the main mirror. The optical quality does not suffer because of

this mark, as the secondary mirror keeps the light from falling onto the

as a 5mm band around the edge is not used optically.

centre region of the main mirror anyway. Measure exactly the centre point

this mark because the secondary mirror keeps the light from falling onto the

Step26 It is necessary for the adjustment to draw a small cross exactly in

centre region of the main mirror anyway. Measure exactly the centre point

with a set-square or a ruler and mark it with a thin felt-tip pen.

centre region of the main mirror anyway. Measure exactly the centre point

the middle of the main mirror. The optical quality does not suffer because of

Step 27 Insert the main mirror holder assembly without any glue from the

with a set-square or a ruler and mark it with a thin felt-tip pen.

this mark because the secondary mirror keeps the light from falling onto the

back into the main body, mirror first. Push it in until the tabs are flush with the

Step 27 Insert the main mirror holder assembly without any glue from the

centre region of the main mirror anyway. Measure exactly the centre point

Step 27 Insert the main mirror holder assembly without any glue from the

end of the body and only the adjusting handles are sticking out. The main

back into the main body, mirror ﬁrst. Push it in until the tabs are ﬂush with

with a set-square or a ruler and mark it with a thin felt-tip pen.

back into the main body, mirror first. Push it in until the tabs are flush with the

mirror is now roughly pre-adjusted. Secure the tabs temporarily in place with

the end of the body and only the adjusting handles are sticking out. The

Step 27 Insert the main mirror holder assembly without any glue from the

end of the body and only the adjusting handles are sticking out. The main

6 paper clips or wash pegs.

main mirror is now roughly pre-adjusted. Secure the tabs temporarily in

back into the main body, mirror first. Push it in until the tabs are flush with the

mirror is now roughly pre-adjusted. Secure the tabs temporarily in place with

Step 28 Make sure the telescope opening is not pointed at the sun and look

place with 6 paper clips or clothes pegs.

end of the body and only the adjusting handles are sticking out. The main

6 paper clips or wash pegs.

into the eyepiece connector. Light from the front opening of the telescope is

Step 28 Make sure the telescope opening is not pointed at the sun and look

mirror is now roughly pre-adjusted. Secure the tabs temporarily in place with

Step 28 Make sure the telescope opening is not pointed at the sun and look

into the eyepiece connector. Light from the front opening of the telescope is

6 paper clips or wash pegs.

into the eyepiece connector. Light from the front opening of the telescope is

Step 28 Make sure the telescope opening is not pointed at the sun and look

now reﬂected by the main mirror. In the middle of this circular patch of light

into the eyepiece connector. Light from the front opening of the telescope is

you can see the secondary mirror, which appears to be square as it is tilted

at 45 degrees.

now reflected by the main mirror. In

the middle of this circular patch of light

now reflected by the main mirror. In

you can see the secondary mirror,

the middle of this circular patch of light

which appears to be square as it is

now reflected by the main mirror. In

you can see the secondary mirror,

tilted at 45 degrees.

the middle of this circular patch of light

which appears to be square as it is

you can see the secondary mirror,

The Basic Adjustment

tilted at 45 degrees.

which appears to be square as it is

For terrestrial observations by day as

tilted at 45 degrees.

For terrestrial observations by day as

The Basic Adjustment

well as observing the moonʼs craters or

well as observing the moon's craters

The Basic Adjustment

For terrestrial observations by day as

sunspots on the sun the following steps

or sunspots on the sun the following

For terrestrial observations by day as

well as observing the moon's craters

are normally sufﬁcient. (Important: You

steps are normally sufficient. (Impor-

well as observing the moon's craters

or sunspots on the sun the following

must use a sun ﬁlter to look at the

tant: You must use a sun filter to look

or sunspots on the sun the following

steps are normally sufficient. (Impor-

sun!) With some luck it will also be good

at the sun.) With some luck it will also

steps are normally sufficient. (Impor-

tant: You must use a sun filter to look

enough for the observation of point light

be good enough for the observation

tant: You must use a sun filter to look

at the sun.) With some luck it will also

of point light sources at night, such

sources at night, such as Jupiterʼs

at the sun.) With some luck it will also

be good enough for the observation

moons, so that the ﬁne adjustment (Step

be good enough for the observation

of point light sources at night, such

56) can be skipped.

of point light sources at night, such

as Jupiter's moon, so that the fine adjustment (step 56) can be skipped.

Step 29 Look through the eyepiece connector at the secondary mirror. If

Step 29 Look at the secondary mirror through the eyepiece connector. If the

as Jupiter's moon, so that the fine adjustment (step 56) can be skipped.

construction was perfect, the main mirror will appear as a perfect round shape

construction was perfect, the main mirror will appear as a perfect round

Step 29 Look through the eyepiece connector at the secondary mirror. If

with the square secondary mirror in its centre. Now move your eye back to a

shape with the square secondary mirror in its centre. Now move your eye

construction was perfect, the main mirror will appear as a perfect round shape

point where the secondary mirror appears to completely fill the opening of

back to a point where the secondary mirror appears to completely ﬁll the

with the square secondary mirror in its centre. Now move your eye back to a

the eyepiece connector. Keep your eye directly vertical above the eyepiece.

opening of the eyepiece connector. Keep your eye directly vertical above

point where the secondary mirror appears to completely fill the opening of

If the secondary and main mirrors are correctly set up, the pupil of your eye

the eyepiece. If the secondary and main mirrors are correctly set up, the

the eyepiece connector. Keep your eye directly vertical above the eyepiece.

should appear in the middle of the secondary mirror and the centre mark-

as Jupiter's moon, so that the fine adjustment (step 56) can be skipped.

pupil of your eye should appear in the middle of the secondary mirror and

If the secondary and main mirrors are correctly set up, the pupil of your eye

ings of the main mirror should be in the middle of your pupil. See for yourself

Step 29 Look through the eyepiece connector at the secondary mirror. If

the centre markings of the main mirror should be in the middle of your pupil.

should appear in the middle of the secondary mirror and the centre mark-

which of the adjustment tabs needs to be moved a little bit in or out in order

construction was perfect, the main mirror will appear as a perfect round shape

Try out which of the adjustment tabs needs to be moved a little bit in or out

ings of the main mirror should be in the middle of your pupil. See for yourself

for the mirrors, your pupil and the centre markings to be lined up correctly.

with the square secondary mirror in its centre. Now move your eye back to a

in order for the mirrors, your pupil, and the centre markings to be lined up

which of the adjustment tabs needs to be moved a little bit in or out in order

After the alignment the main mirror mounting should be just as far down in

point where the secondary mirror appears to completely fill the opening of

for the mirrors, your pupil and the centre markings to be lined up correctly.

correctly. After the alignment the main mirror mounting should be just as far

the tube as it was before. The more exact the alignment, the better the ad-

the eyepiece connector. Keep your eye directly vertical above the eyepiece.

After the alignment the main mirror mounting should be just as far down in

down in the tube as it was before. The more exact the alignment, the better

justment of the main mirror. Secure the tabs once again with pegs.

If the secondary and main mirrors are correctly set up, the pupil of your eye

the tube as it was before. The more exact the alignment, the better the ad-

Step 30 If your pupil is not in the centre of the secondary mirror there may be

the adjustment of the main mirror. Secure the tabs once again with pegs.

should appear in the middle of the secondary mirror and the centre mark-

justment of the main mirror. Secure the tabs once again with pegs.

ings of the main mirror should be in the middle of your pupil. See for yourself

various reasons:

Step 30 If your pupil is not in the centre of the secondary mirror there may

Step 30 If your pupil is not in the centre of the secondary mirror there may be

which of the adjustment tabs needs to be moved a little bit in or out in order

1) The secondary mirror may not be directly under the eyepiece connector.

be various reasons:

various reasons:

for the mirrors, your pupil and the centre markings to be lined up correctly.

In this instance the secondary mirror holder needs to be pushed in or out of

1) The secondary mirror may not be directly under the eyepiece connector.

After the alignment the main mirror mounting should be just as far down in

1) The secondary mirror may not be directly under the eyepiece connector.

the main body a small amount.

In this instance the secondary mirror holder needs to be pushed in or out

the tube as it was before. The more exact the alignment, the better the ad-

In this instance the secondary mirror holder needs to be pushed in or out of

2) The secondary mirror is not exactly at 45 degrees to the axis of the main

of the main body by a small amount.

justment of the main mirror. Secure the tabs once again with pegs.

the main body a small amount.

body. In this case only the head or foot tabs of the holder need to be moved.

2) The secondary mirror is not exactly at 45 degrees to the axis of the main

Step 30 If your pupil is not in the centre of the secondary mirror there may be

2) The secondary mirror is not exactly at 45 degrees to the axis of the main

body. In this case only the head or foot tabs of the holder need to be

various reasons:

body. In this case only the head or foot tabs of the holder need to be moved.

moved.

1) The secondary mirror may not be directly under the eyepiece connector.

In this instance the secondary mirror holder needs to be pushed in or out of

the main body a small amount.

2) The secondary mirror is not exactly at 45 degrees to the axis of the main

body. In this case only the head or foot tabs of the holder need to be moved.

The eyepieces

The two eyepieces have different focal lengths, namely f=15mm and f=28mm,

The eyepieces

so that different magnifications are possible. The magnification is calculated

The two eyepieces have different focal lengths, namely f=15mm and f=28mm,

The two eyepieces have different focal lengths, namely f=15mm and

by the focal length of the main mirror divided by the focal length of the eye-

so that different magnifications are possible. The magnification is calculated

piece i.e. 450/15=30 and 450/28=16. The lenses made out of acrylic glass

f=28mm, so that different magniﬁcations are possible. The magniﬁcation is

by the focal length of the main mirror divided by the focal length of the eye-

The eyepieces

are all plano-convex (one side is flat and the other curved outwards).

calculated by the focal length of the main mirror divided by the focal length

piece i.e. 450/15=30 and 450/28=16. The lenses made out of acrylic glass

The two eyepieces have different focal lengths, namely f=15mm and f=28mm,

The 15mm eyepiece consists of two lenses with f=30mm and is called a

of the eyepiece i.e. 450/15=30 and 450/28=16. The lenses made out of

are all plano-convex (one side is flat and the other curved outwards).

so that different magnifications are possible. The magnification is calculated

Ramsden eyepiece after its inventor. It can reduce the colour distortions of

acrylic glass are all planoconvex (one side is ﬂat and the other curved

by the focal length of the main mirror divided by the focal length of the eye-

The 15mm eyepiece consists of two lenses with f=30mm and is called a

the eye lens through the second lens called the Ramsden lens. The curved

outwards).

piece i.e. 450/15=30 and 450/28=16. The lenses made out of acrylic glass

Ramsden eyepiece after its inventor. It can reduce the colour distortions of

side of this lens is facing the eye lens.

The 15mm eyepiece consists of two lenses with f=30mm and is called a

are all plano-convex (one side is flat and the other curved outwards).

the eye lens through the second lens called the Ramsden lens. The curved

The 28mm eyepiece with three lenses has a particularly good colour correc-

Ramsden eyepiece after its inventor. It reduces the colour distortions of the

The 15mm eyepiece consists of two lenses with f=30mm and is called a

side of this lens is facing the eye lens.

tion and fringe focus.

eye lens through the second lens called the Ramsden lens. The curved side

Ramsden eyepiece after its inventor. It can reduce the colour distortions of

The 28mm eyepiece with three lenses has a particularly good colour correc-

Step 31 Only three of the five accompanying lenses have the same focal

of this lens is facing the eye lens.

the eye lens through the second lens called the Ramsden lens. The curved

tion and fringe focus.

length of f =30mm, the fourth has a focal length of f =49mm and the fifth

side of this lens is facing the eye lens.

The 28mm eyepiece with three lenses has a particularly good colour

Step 31 Only three of the five accompanying lenses have the same focal

f =65mm. Because they all look very similar and have the same diameter,

The 28mm eyepiece with three lenses has a particularly good colour correc-

correction and fringe focus.

length of f =30mm, the fourth has a focal length of f =49mm and the fifth

you must first establish which lens has which focal length.

tion and fringe focus.

Step 31 Only three of the ﬁve accompanying lenses have the same focal

f =65mm. Because they all look very similar and have the same diameter,

Place each lens on printed paper with the curved side down. Raise them

Step 31 Only three of the five accompanying lenses have the same focal

length of f=30mm, the fourth has a focal length of f=49mm, and the ﬁfth of

you must first establish which lens has which focal length.

slowly off the paper and when the ever increasing magnification suddenly

length of f =30mm, the fourth has a focal length of f =49mm and the fifth

f=65mm. Since they all look very similar and have the same diameter, you

Place each lens on printed paper with the curved side down. Raise them

goes out of focus and turns upside down, the distance of the lens from the

f =65mm. Because they all look very similar and have the same diameter,

must ﬁrst establish which lens has which focal length.

slowly off the paper and when the ever increasing magnification suddenly

you must first establish which lens has which focal length.

paper corresponds to its focal length.

Place each lens on printed paper with the curved side down. Raise them

goes out of focus and turns upside down, the distance of the lens from the

Place each lens on printed paper with the curved side down. Raise them

Step 32 Fold and glue the eyepiece shaft 15mm [F1] to form a hexagonal

slowly off the paper and when the ever-increasing magniﬁcation suddenly

paper corresponds to its focal length.

slowly off the paper and when the ever increasing magnification suddenly

tube, black side inward.

goes out of focus and turns upside down, the distance of the lens from the

Step 32 Fold and glue the eyepiece shaft 15mm [F1] to form a hexagonal

goes out of focus and turns upside down, the distance of the lens from the

Step 33 Remove the small disc from the middle of the eye lens mounting for

paper corresponds to its focal length.

tube, black side inward.

the 15mm eyepiece [F2], resulting in a pupil. Fold the six tabs to the back.

Step 32 Fold and glue the eyepiece shaft 15mm [F1] to form a hexagonal

Step 33 Remove the small disc from the middle of the eye lens mounting for

Step 32 Fold and glue the eyepiece shaft 15mm [F1] to form a hexagonal

Take one of the f =30mm lenses and glue it with the flat side to the black

tube, black side inward.

the 15mm eyepiece [F2], resulting in a pupil. Fold the six tabs to the back.

tube, black side inwards.

unprinted side of the eye lens mounting. Put a little glue on the mounting but

Step 33 Remove the small disc from the middle of the eye lens mounting for

Take one of the f =30mm lenses and glue it with the flat side to the black

Step 33 Remove the small disc from the middle of the eye lens mounting

not too much and not as far as the edge of the pupil, otherwise it will be

the 15mm eyepiece [F2], resulting in a pupil. Fold the six tabs to the back.

unprinted side of the eye lens mounting. Put a little glue on the mounting but

for the 15mm eyepiece [F2], resulting in a pupil. Fold the six tabs to the

squeezed onto the lens when the lens is pressed on the card. Place the lens

Take one of the f =30mm lenses and glue it with the flat side to the black

not too much and not as far as the edge of the pupil, otherwise it will be

back. Take one of the f=30mm lenses and glue it with the ﬂat side to the

exactly central over the pupil. Leave to dry.

unprinted side of the eye lens mounting. Put a little glue on the mounting but

squeezed onto the lens when the lens is pressed on the card. Place the lens

Step 34 Remove the Ramsden lens mounting [F3]. This is a narrow strip of

black unprinted side of the eye lens mounting. Put a little glue on the

not too much and not as far as the edge of the pupil, otherwise it will be

exactly central over the pupil. Leave to dry.

card. Fold all the grooves to the back and glue it to form a hexagonal ring.

mounting but not too much and not as far as the edge of the pupil,

squeezed onto the lens when the lens is pressed on the card. Place the lens

Step 34 Remove the Ramsden lens mounting [F3]. This is a narrow strip of

After the eye lens [F2] has dried slide the ring [F3] over the lens. It should sit

otherwise it will be squeezed onto the lens when the lens is pressed on the

exactly central over the pupil. Leave to dry.

card. Fold all the grooves to the back and glue it to form a hexagonal ring.

Step 34 Remove the Ramsden lens mounting [F3]. This is a narrow strip of

fairly tightly and touch the lens mounting with its edge on all sides. Remove

card. Place the lens exactly central over the pupil. Leave to dry.

After the eye lens [F2] has dried slide the ring [F3] over the lens. It should sit

card. Fold all the grooves to the back and glue it to form a hexagonal ring.

the ring again, place a few drops of glue around the lens and slide the ring a

Step 34 Remove the Ramsden lens mounting [F3]. This is a narrow strip of

fairly tightly and touch the lens mounting with its edge on all sides. Remove

After the eye lens [F2] has dried slide the ring [F3] over the lens. It should sit

second time over the lens. Leave to dry.

card. Fold all the grooves to the back and glue it to form a hexagonal ring.

the ring again, place a few drops of glue around the lens and slide the ring a

fairly tightly and touch the lens mounting with its edge on all sides. Remove

Step 35 Now take a second f =30mm lens. This is the Ramsden lens. Place

After the eye lens [F2] has dried slide the ring [F3] over the lens. It should

second time over the lens. Leave to dry.

the ring again, place a few drops of glue around the lens and slide the ring a

it, flat side down on your work surface. Turn the lens mounting upside down

sit fairly tightly and touch the lens mounting with its edge on all sides.

Step 35 Now take a second f =30mm lens. This is the Ramsden lens. Place

second time over the lens. Leave to dry.

and slide the open ring over the Ramsden lens. The curved surfaces of the

Remove the ring again, place a few drops of glue around the lens and slide

Step 35 Now take a second f =30mm lens. This is the Ramsden lens. Place

it, flat side down on your work surface. Turn the lens mounting upside down

eye lens and Ramsden lens are now facing each other. Remove the Ram-

the ring over the lens again. Leave to dry.

it, flat side down on your work surface. Turn the lens mounting upside down

and slide the open ring over the Ramsden lens. The curved surfaces of the

sden lens again, place a few drops of glue around the inside of the ring and

Step 35 Now take a second f=30mm lens. This is the Ramsden lens. Place

and slide the open ring over the Ramsden lens. The curved surfaces of the

eye lens and Ramsden lens are now facing each other. Remove the Ram-

slide it once again over the Ramsden lens which, when the glue has dried,

it ﬂat side down on your work surface. Turn the lens mounting upside down

eye lens and Ramsden lens are now facing each other. Remove the Ram-

sden lens again, place a few drops of glue around the inside of the ring and

should lie flush with the outside edge of the ring. Take care not to get any

sden lens again, place a few drops of glue around the inside of the ring and

and slide the open ring over the Ramsden lens. The curved surfaces of the

slide it once again over the Ramsden lens which, when the glue has dried,

glue on the surface of the lens. Leave to dry.

slide it once again over the Ramsden lens which, when the glue has dried,

eye lens and Ramsden lens are now facing each other. Remove the Rams-

should lie flush with the outside edge of the ring. Take care not to get any

den lens again, place a few drops of glue around the inside of the ring and

glue on the surface of the lens. Leave to dry.