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Ben, what matters is the true field of view of the scope, not the apparent field of view of the eyepiece. The C9.25 is the smallest Celestron that can usefully take 2" eyepieces and certainly I would say go for a 2" back and 2" diagonal because at f/10 your scope can fill large low power eyepieces such as the panoptic 41, vixen lv 50mm (50 degree afov) or lvw 42mm (65 degrees afov), or the ES 30mm 82-degree afov.
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