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The clear aperture of the Denkmeier Binotron27 is 26mm. The 45mm refers to the corrector. You cannot use 2" eyepieces in them. The widest true field will be from something like a Panoptic24mm.
The A45 corrector is useful for scopes such a Newts where the scopes focal ratio is F4 or F5 which means a smaller diameter corrector would actually vignette the incoming light cone.....
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