Celestron Super C8 Manuel d'instruction - Page 5

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Slightly tighten the three nylon tipped thumbscrews on the front ring of the bracket to hold the finder

in place.

Once on, push the finder back until the O-ring is snug inside the back ring of the finder bracket.

Hand tighten the three nylon tipped thumbscrews until snug.

Aligning the Finderscope

Accurate alignment of the finder makes it easy to find objects with the telescope, especially celestial objects. To

make aligning the finder as easy as possible, this procedure should be done in the daytime when it is easy to find and

identify objects. The finderscope has three adjustment screws that put pressure on the finderscope while adjusting

the finder horizontally and vertically. To align the finder:

Choose a target that is in excess of one mile away. This eliminates any possible parallax effect between the

telescope and finder.

Release the altitude and azimuth clamps and point the telescope at your target.

Center your target in the main optics of the telescope. You may have to move the telescope slightly to center it.

Adjust the screw on the finder bracket that is on the right (when looking through the finder) until the crosshairs are

centered horizontally on the target seen through the telescope.

Adjust the screw on the top of the finder bracket until the crosshairs are centered vertically on the target seen

through the telescope.

Image orientation through the finder is inverted (i.e., upside down and backwards left-to-right). This is normal for

any finder that is used straight-through. Because of this, it may take a few minutes to familiarize yourself with the

directional change each screw makes on the finder.

Focusing

The Schmidt-Cassegrain focusing mechanism controls the primary mirror which is

mounted on a ring that slides back and forth on the primary baffle tube. The focusing knob,

which moves the primary mirror, is on the rear cell of the telescope just below the star

diagonal and eyepiece. Turn the focusing knob until the image is sharp. If the knob will

not turn, it has reached the end of its travel on the focusing mechanism. Turn the knob in

the opposite direction until the image is sharp. Once an image is in focus, turn the knob

clockwise to focus on a closer object and counterclockwise for a more distant object. A

single turn of the focusing knob moves the primary mirror only slightly. Therefore, it will

take many turns (about 30) to go from close focus to infinity.

For astronomical viewing, out of focus star images are very diffuse, making them difficult

to see. If you turn the focus knob too quickly, you can go right through focus without

seeing the image. To avoid this problem, your first astronomical target should be a bright

object (like the Moon or a planet) so that the image is visible even when out of focus.

Critical focusing is best accomplished when the focusing knob is turned in such a manner

that the mirror moves against the pull of gravity.

minimized. For astronomical observing, both visually and photographically, this is done by

turning the focus knob counterclockwise.

C14 Users:

Before turning the focus knob, remember to lossen to two mirror locking knobs located on the rear cell of the

telescope. These knobs connect a screw to the primary mirror mounting plate and prevent the mirror from moving when locked

down. These screws should be locked down when transporting the telescope.

In doing so, any mirror shift is

Figure 1-5

The emblem on the end of

the focus knob shows the

correct rotational direction

for focusing your telescope