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The C8 has a 38mm clear aperture at the rear of the scope. A practical low power eyepiece that avoids vignetting is the 35mm Panoptic which has a 38mm field stop. A 31mm Nagler would be useable but with some vignetting since it has a 42mm field stop.
I tried a 50mm GSO superview with a C8 and while the eyepiece is decent, I didn't keep using it due to sky brightness in my light polluted yard - it would be fine at a dark site.
Last edited by casstony; 20-07-2011 at 05:56 PM.
Reason: removed error regarding C9.25 baffle size
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