ASTRODEVICE TC 900, User Manual

Page: 40 / 42

Note: In fi g. 40, the outline of the white strip under the drawer has been
artifi cially applied to the photo to better illustrate its placement.
5. Adjust the position so that you can feel the resistance, but still be able to still
slide the strip out from under the screw. Then remove the strip and move to
the next tilt adjustment screw.
Note: going through this procedure will put each adjustment screw about the
thickness of a sheet of paper above the surface of the camera housing. For a
sheet of 80g/m2 paper, this is about 0.1mm. After adjusting the screws with
the strip, you can lower each screw by about 0.1 mm by turning it 45 degrees
clockwise. This action requires a lot of precision so that the rotation is the
same for each screw.
Tip: since for many a 0.1 mm backfocus deviation is of secondary importance
when the tilt is set correctly, you may want to try putting the camera on the
telescope fi rst without further tightening the three screws by the thickness of
a sheet of paper. It’s a matter of trying the result, but it’s worth starting there
before you decide to fi ne-tuning each of the screws by a further 0.1 mm.
6. After adjusting all the screws, unscrew the mounting brackets, remove the
drawer from the Tilt Corrector, unscrew the Tilt Corrector from the camera,
screw the original mounting screws into the front of the camera housing and
put the adjusted fi lter drawer on the camera.
Remember that if the tilt in your setup does not rotate with the camera, you must
put the camera in the same rotational relationship to the telescope as when you
used the Tilt Corrector. The photo you took before you removed the camera from
the telescope will help you reproduce this position.
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