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• When using your C5 as a telephoto lens, the split screen or microprism focuser of
the 35mm SLR camera may “black out.” This is common with all long focal
length lenses. If this happens, use the ground glass portion of your focusing
screen. To achieve a very sharp focus, consider using a focusing magnifier.
(These are readily available from your local camera store.)
• If you wear corrective lenses (specifically glasses), you may want to remove
them when observing with an eyepiece attached to your C5. When using a
camera, however, you should always wear corrective lenses to ensure the
sharpest possible focus. If you have astigmatism, corrective lenses should be
worn at all times.
Your Celestron C5 can be used for both terrestrial and astronomical
photography. Your C5 has a fixed aperture and, as a result, a fixed f/ratio. To
properly expose your subjects photographically, you need to set your shutter
speed accordingly. Most 35mm single lens reflex (SLR) cameras offer
through-the-lens metering that lets you know if your picture is under or
overexposed. This is important for terrestrial photography where exposure
times are measured in fractions of a second.
To reduce vibration when tripping the shutter, use a cable release. Releasing the
shutter manually can cause vibration, something that produces blurred photos. A
cable release allows you to keep your hands clear of the camera and spotting
scope, thus reducing the possibility of shaking the spotting scope. Mechanical
shutter releases can be used, though air-type releases are
& MAINTENANC
While the C5 spotting scope requires little maintenance, there are a few things to
remember that will ensure your spotting scope performs at its best.
Occasionally, dust and/or moisture may build up on the corrector plate of your
C5. Special care should be taken when cleaning any instrument so as not to
damage the optics.
If dust has built up on the corrector plate, remove it with a brush (made of
camel’s hair) or a can of pressurized air. Spray at an angle to the lens for
approximately two to four seconds. Then, use an optical cleaning solution and
white tissue paper to remove any remaining debris. Apply the solution to the
tissue and then apply the tissue paper to the lens. Low pressure strokes should go
from the center of the corrector to the outer portion. Do NOT rub in circles!
You can use a commercially made lens cleaner or mix your own. A good
cleaning solution is isopropyl alcohol mixed with distilled water. The solution
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