Celestron c90 telescope manual

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This manual is broken down into several sections. The first covers attaching your spotting scope to a stable platform, like a photographic tripod, so that the standard accessories can be attached. Any adjustments of these screws will automatically void your warranty. Please contact Celestron if you feel your C90 is out of collimation.

The C90 spotting scope uses a combination of mirrors and lenses to produce an image. Page 5: Removing The Lens Cover 1.

Loosen the thumbscrew on the rear cell of the C90 so that the opening i. Page 6 Focusing To focus, turn the focus ring on the C90 tube until the image is sharp. On the rubber covered C90, turn the front portion of the lens to focus. For objects closer than the one you are currently observing, turn the focusing ring clockwise and for objects further away, turn counterclockwise. Once again, turn the focusing ring until the image is sharp. Page 8 C The T-Adapter, then threads over the filter to hold it in place.

To attach a video camera to the C Remove all accessories from the C The spotting scope can be left on a tripod for display purposes or returned to its shipping carton. Since the rear cell of your C90 spotting scope is not sealed, the eyepiece or protective cover MUST be placed over the opening in the rear cell when not in use.

Page Calculating Magnification Power C90, the maximum useful magnification is power. This is derived from multiplying 60 times 3. Although this is the maximum useful magnification, most observing is done in the range of 20 to 35 power for every inch of aperture which for the C90 is 70 to Field of View Determining the field of view is important if you want to get an idea of the size of the object you are observing.

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