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Markus,
I have a UO 7mm ortho which is optically great and I can handle the eye relief. However I find the 5mm too short for comfort and never used it much. FWIW I have a 7.5mm Celestron silver top plossl from the 70's which I used to think was OK. The UO ortho eats it. If I was going to go for less glass my preference would be towards orthos.
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