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Old 20-07-2011, 05:54 PM
casstony
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Join Date: Feb 2006
Location: Warragul, Vic
Posts: 4,494
Quote:
Originally Posted by The_bluester View Post
If you mean the ID of the baffle tube which the visual back screws to, on the 9.25" the inside diameter is about 44mm. .
In that case you won't have a problem with vignetting with any low power eyepiece. Even if there was vignetting with a 41 Panoptic for example (46mm field stop) it would be so minor you wouldn't notice it.

The C9.25 has a slightly flatter field than the other schmidt cassegrains so the coma/field curvature will be less evident in the outer field of a low power eyepiece. A 31mm Nagler would be very nice and tend to show less outer field aberrations than lesser wide fields.

If you've yet to buy a 2" diagonal Paul avoid William Optics since they have a 40mm clear aperture.

Last edited by casstony; 20-07-2011 at 06:14 PM.
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