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Jas
The 2" refers to the width of the barrel. There is no intrinsic value or benefit of a 2" vs a 1.25" barrel except that the 2" ones work better with wider field ones, meaning low power, longer focal length ones.
For example if you buy a Nagler, the 16mm version has a 1.25" barrel while the 17mm one is 2" as at that focal length the 1.25" barrel will restrict the field of view.
Hope that is clear enough.
Malcolm
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