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I was actually about to ask a similar question but about my CPC925. The EP that comes with it is a 40mm Plossl in 1.25" and I have wondered on more than a few occasions how low power and how wide TFOV I could successfully go. I have suspectded a couple of times on full moons that I can see a shadow from the secondary with this EP, but given what the light level would do to pupil diameter (Not so sure about this EP but my 11mm Nagler is very sensitive to this, it can be prone to kydney beans and blackouts and the problem is far worse during daylight or on a full moon when pupil diameter would be smaller, it is more or less a frustration unless the eye is well dark adapted)
For some extended objects I have thought I would love to have a greater TFOV than the 40mm Plossl gives me but I just have not been sure how far I could push it. At least the 9.25 has a 2" thread for the visual back for larger format EP's.
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