Celestron C90 Manual de instruções - Página 8
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4. Thread the T-Adapter onto the back of the C90 by rotating the slip ring clockwise while
holding the camera in the desired orientation (either vertical or horizontal).
Focusing
The focusing mechanism is the same photographically and visually. However, due to the high
magnification, the micro prism focuser in your camera may "black out." If this is the case, you
will have to use the ground glass portion of your focusing screen, which itself may be dark. For
the best results, take your time. Look at your subject carefully to make sure that you have the
sharpest possible focus. To achieve a very sharp focus, consider using a focusing magnifier.
These devices are readily available from your local camera store.
If you can not get a sharp focus, check to see if your subject is closer than the near focus distance
listed in the "Technical Specification" section.
Filters
Sometimes it is desirable to use filters to increase photographic contrast. You can use Series V
drop-in filters available at some large specialty photography stores. They drop into the rear cell of
the C90. The T-Adapter, then threads over the filter to hold it in place.
Attaching a Video Camera
The C90 can be adapted to a video or Super 8 movie camera by using the optional T-C 16mm
Adapter (#93636) and the C90 T-Adapter (#93635-A). To attach a video camera to the C90:
1.
Remove all accessories from the C90.
2.
Remove the video camera's normal lens.