Orion 8 EQ Bedienungsanleitung PDF herunterladen (Seite 18)

piggyback adapter counter-clockwise until the camera is

locked into position.

Aim the telescope at a deep-sky object. It should be a fairly

large deep-sky object, as the camera lens will likely have a

wide field of view. Check to make sure that the object is also

centered in the camera’s viewfinder. Turn the motor drive on.

Now, look into the telescope’s eyepiece and center the bright-

est star within the field of view. Remove the eyepiece and

insert the illuminated reticle eyepiece into the focuser draw-

tube. Turn the eyepiece’s illuminator on (dimly!). Recenter the

bright star (guide star) on the crosshairs of the reticle eye-

piece. Check again to make sure that the object to be

photographed is still centered within the camera’s field of view.

If it is not, recenter it by repositioning the camera on the pig-

gyback adapter, or by moving the main telescope. If you move

the main telescope, then you will need to recenter another

guide star on the illuminated eyepiece’s crosshairs. Once the

object is centered in the camera and a guide star is centered

in the reticle eyepiece, you’re ready to shoot.

Deep-sky objects are quite faint, and typically require expo-

sures on the order of 10 minutes.To hold the camera’s shutter

open this long, you will need a lock shutter release cable. Set

the camera’s shutter to the “B” (bulb) setting. Depress the

locking shutter release cable and lock it.You are now expos-

ing your first deep-sky object.

While exposing through the camera lens, you will need to

monitor the accuracy of the mount’s tracking by looking

through the illuminated reticle eyepiece in the main telescope.

If the guide star drifts from its initial position, then use the

hand controller of the motor drive to “move” the guide star

back to the center of the crosshairs. Any drifting along the

Dec. axis is a result of improper polar alignment, so if the

guide star drifts greatly in Dec., the mount may need to be

polar aligned more accurately.

When the exposure is complete, unlock the shutter release

cable and close the camera’s shutter.

Astrophotography can be enjoyable and rewarding, as well as

frustrating and time-consuming. Start slowly and consult out-

side resources, such as books and magazines, for more

details about astrophotography. Remember….have fun!

10. Care and Maintenance

If you give your telescope reasonable care, it will last a life-

time. Store it in a clean, dry, dust-free place, safe from rapid

changes in temperature and humidity. Do not store the tele-

scope outdoors, although storage in a garage or shed is OK.

Small components like eyepieces and other accessories

should be kept in a protective box or storage case. Keep the

dust cover on the front of the telescope when not in use.

Your SkyView Pro 8 EQ requires very little mechanical main-

tenance. The optical tube is steel and has a smooth painted

finish that is fairly scratch-resistant. If a scratch does appear

on the tube, it will not harm the telescope. Smudges on the

tube can be wiped off with a soft cloth and a household clean-

er such as Windex or Formula 409.

Cleaning Lenses

Any quality optical lens cleaning tissue and optical lens clean-

ing fluid specifically designed for multi-coated optics can be

used to clean the exposed lenses of your eyepieces or finder

scope. Never use regular glass cleaner or cleaning fluid

designed for eyeglasses. Before cleaning with fluid and tissue,

however, blow any loose particles off the lens with a blower

bulb or compressed air. Then apply some cleaning fluid to a

tissue, never directly on the optics. Wipe the lens gently in a

circular motion, then remove any excess fluid with a fresh lens

tissue. Oily fingerprints and smudges may be removed using

this method. Use caution; rubbing too hard may scratch the

lens. On larger lenses, clean only a small area at a time, using

a fresh lens tissue on each area. Never reuse tissues.

Cleaning Mirrors

You should not have to clean the telescope’s mirrors very

often; normally once every year or so. Covering the telescope

with the dust cover when it is not in use will prevent dust from

accumulating on the mirrors. Improper cleaning can scratch

mirror coatings, so the fewer times you have to clean the mir-

rors, the better. Small specks of dust or flecks of paint have

virtually no effect on the visual performance of the telescope.

The large primary mirror and the elliptical secondary mirror of

your telescope are front-surface aluminized and over-coated

with hard silicon dioxide, which prevents the aluminum from

oxidizing. These coatings normally last through many years of

use before requiring re-coating (which is easily done).

To clean the secondary mirror, first remove it from the tele-

scope. Do this by holding the secondary mirror holder

stationary while turning the center Phillips head screw. Be

careful, there is a spring between the secondary mirror hold-

er and the Philips head screw. Be sure that the spring or the

secondary holder will not fall into the optical tube and hit the

primary mirror. Handle the mirror by its holder; do not touch

the mirror surface. Then follow the same procedure described

below for cleaning the primary mirror. You do not need to

remove the secondary mirror from its holder when cleaning.

To clean the primary mirror, carefully remove the mirror cell

from the telescope. For the SkyView Pro 8 EQ, this means you

must loosen the six screws on the side of the tube near the

primary mirror. You do not need to remove the collimation

screws on the bottom of the mirror cell. Remove the mirror cell

from the tube.You will notice the primary mirror is held down

with three clips held by two screws each. Loosen the screws

and remove the clips.

You may now remove the mirror from the mirror cell. Do not

touch the surface of the mirror with your fingers. Lift the mirror

carefully by the edges. Set the mirror on a clean soft towel. Fill

a clean sink free of abrasive cleanser, with room-temperature

water, a few drops of liquid dishwashing detergent, and if pos-

sible, a capfull of rubbing alcohol. Submerge the mirror

(aluminized face up) in the water and let it soak for a few min-

utes (or hours if it’s a very dirty mirror). Wipe the mirror under

water with clean cotton balls, using extremely light pressure

and stroking in straight line across the mirror. Use one ball for

each wipe across the mirror. Then rinse the mirror under a

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