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Thanks for the explanations on diagonal offset. Very clearly understood now.
Along a similar path, the Newt program is telling me I can have a 50mm diagonal mirror with my 10" f\5 primary. Another formula I have for calculating diagonal size tells me a 50mm diagonal is too small for this primary. The next size diagonal (GSO) is 63mm. Jumping up to a 63mm diagonal will reduce the light gathering ability a little. Can anyone advise which way to go (50 or 63mm diagonal) from practical experience?
Also, going back to the title of this post, I gather that the wide angle eyepieces will only be effected by the telescope design if there was a problem with the design in the first place (ie they amplify problems)? Is that a correct assumption?
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