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Gary, A 2" eyepiece of any given focal length, simply gives a wider field of view than a 1.25" eyepiece of the same focal length. It does not give
a larger image. The image size is governed by the focal length of an eyepiece, therefore a 10mm 1.25" EP gives the same size image as a 2" 10mm EP, but a narrower field of view. Many older scopes cannot take 2" EPs, and their owners happily use 1.25" EPs.
raymo
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