AstroMedia 209.NST Talimatlar - Sayfa 5

Teleskop AstroMedia 209.NST için çevrimiçi göz atın veya pdf Talimatlar indirin. AstroMedia 209.NST 5 sayfaları. The reflecting telescope

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the markings and butt ﬁrmly up against the tabs of the right hand support

without any gaps. The buttress support should cover the glue markings on

the side support and the pointer on the triangle should line up with the

lowest point of the axle bearing. Glue the buttress support into this position.

Step 57 Repeat with the front and rear parts of the left-hand side buttress

support [K3] and [K4]. They are mirror images of the right hand side but

otherwise identical. Glue into place on the left-hand side support.

The Eyepiece Storage Holders

Because only one eyepiece at a time is used, you need some place to store

the other eyepiece along with the cover for the eyepiece connector.

Step 58 Fold all the grooves of the neck of the eyepiece connector cover

[B4] to the back and glue it to form a hexagonal pipe. Then glue the tabs of

the neck to the eyepiece connector cover [B5]. Slide the ﬁnished cover into

the eyepiece connector to protect the secondary mirror from dust.

Step 59 Remove the right eyepiece holder [L1] and fold all folds to the back

except for the small tab with the screws which folds to the front. Hold it with

the chamfered end of the tabs uppermost and glue the tab with the screw

heads to the appropriate mark on the right hand support. The tab at the

other end is glued to the buttress support.

Step 60 Repeat with the other eyepiece holder [L2] on the other side.

Step 61 Now carefully place the axles of your telescope into the axle

bearings of the supports. Do not disturb the paper-clips on the mirror holder.

The end of the body with the main mirror should be at the open side of the

mounting support and the eyepiece should be slanted on top just like the

colour cover picture of the kit. If you have determined after several

observations with the eyepieces that the basic adjustment of the main

mirror has given you a sufﬁciently good image you can skip the next section

on "ﬁne adjustment" and proceed straight to the ﬁnal assembly in Step 65.

Fine Adjustment – Optional

When magniﬁed, planets appear as small discs but stars remain points of

light, however much you magnify them. The quality of a telescope is shown

by the appearance of these points of light and one can use them to optimise

the image of this telescope, of course only within the technical limits of a

cardboard construction. If you are not happy with the result of the basic

adjustment of the telescope, in particular with the view of a star or other far

distant points of light, you can try to improve it with the following steps. You

will need a steady hand and a lot of patience, because the ﬁner the

adjustment, the smaller the corrections that are needed, and sometimes it

will be necessary to adjust the adjustment of an adjustment...

Step 62 To achieve the optimal adjustment of the telescope you have to

point it at a star; only it is difﬁcult to make the adjustments in the dark. In

order to work in daylight you need an artiﬁcial star in the form of a

Christmas tree bauble or similar hanging up about 40m away with a dark

background for best results. If you look at the ball with the Sun behind you,

you see the Sunʼs reﬂection in the surface of the ball as a point of light. You

donʼt need the sun ﬁlter to look at this because the reﬂection is so small.

Step 63 Point the telescope at the Christmas tree bauble with the 28mm

eyepiece to start with and get the point of light in the centre of the ﬁeld of

view. Check whether it remains a point of light after carefully focussing the

eyepiece. If the light is smeared out to one side then the main mirror must

be adjusted very slightly to correct this and obtain the best point. Check that

you are happy with the results from the other eyepiece.

Step 64 In order to be absolutely sure you can check the telescope again at

night by observing a star or distant point of light. Do not forget however that

you can not expect quite the same image quality from a hand-built card-

Understand Science with the fascinating and fully operational cardboard kits by AstroMedia

The Stardial

Visit our website www.AstroMediaShop.co.uk for more kits, optical components, and interesting gadgets.

AstroMedia UK ✵ Landell ✵ Brick Kiln Lane ✵ Ingham, Norwich ✵ NR12 9SX ✵ Phone: 07864 912372 ✵ [email protected]

The Orrery

and many, many more .....

board telescope with acrylic lenses as you would expect from a much more

expensive factory-made optical precision instrument.

Final Assembly

After completion of the basic or ﬁne adjustment, the mirrors can be

permanently ﬁxed and the last card pieces glued on.

Step 65 Glue the secondary mirror holder [D1] in its ﬁnal position. Do this

by removing one of the 4 paper clips, lifting the tab and applying glue

underneath it and then ﬁxing the tab back with the paperclip. Check again

as in Step 29 to make sure the image through the eyepiece connector is still

in the middle of the secondary mirror in case any slight adjustments are

needed to the tab before the glue dries. Repeat this for the remaining three

tabs.

Step 66 Remove the body opening cap [D2] and fold the tabs to the back.

Fit it over the opening of the main body and glue the tabs to the outside of

the tube directly in front of the secondary mirror.

Step 67 Glue the tabs of the main mirror holder into place. Release one tab

at a time and glue it into place, replacing the paper clip until dry. If you want

you can glue the tab with two spots of glue only so that, if necessary, you

can replace the main mirror or re-adjust its position later. Check through the

eyepiece that everything is still in place and then ﬁx the next but one tab in

the same way. Repeat for the next but one again and then ﬁx the remaining

three tabs. Allow to dry thoroughly.

Step 68 Remove the body end cap [E3] and fold the tabs to the back.

Check once more that the mirror is in the right position and then cut off the

adjusting handles protruding from the body. Fit the end cap onto the end of

the main body and glue the tabs to the outside of the tube behind the main

mirror. Again you can use spots of glue so that you can remove it later if

required.

Congratulations! You are now ready for "First Light" as astronomers

call their ﬁrst observations with a new instrument.

We wish you many interesting hours with your home-built reﬂecting

telescope. Perhaps this is only the ﬁrst step towards a bigger instrument.

Please let us know of any interesting experiences that you may have during

construction or use that we may possibly incorporate into future designs or

publish on the internet. We look forward to hearing from you.

Tips for using your Reﬂecting Telescope

1) The image of a mirror telescope is inverted but you can still use

it to look at terrestrial objects. Use the sights to line up the

object and focus it with the eyepiece.

2) To observe sunspots you must use the sun ﬁlter (Article No.

210.NSF). Do not use the sights to point the telescope at the

sun but move the telescope body until the shadow of the rear

sight completely covers the front sight. The number of sunspots

follows a regular cycle of about 11 years. The last maximum of

solar activity was in 2014.

3) The most rewarding object for night time study is undoubtedly

the moon. The craters can be best seen with a waxing or

waning moon in the vicinity of the "shadow line" where the

sunlight grazes the moonʼs surface, creating pronounced

shadows.

4) With careful adjustment of the mirror you can also see Jupiterʼs

moons and indications of Saturnʼs ring.

The Solar Projector

The Steam Engine