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Hi Hans,
It very much depends on what you are doing with the scope. If you are using it for visual then you can lean towards a smaller major axis size and take advantage of better contrast from a reduced central obstruction . If you are imaging with it then to me 2.6” sounds considerably undersized. Depending on your back focus distance, I would expect a desirable size to be much more like over 3”.
Hope this helps
Ryan
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