Quote:
Originally Posted by The_bluester
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. .
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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.