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I have had several 4mm orthos over the years, but never liked any of them. Their eye-relief is just too small. I do have a 5mm KK and am happy with it.
My favourite Ortho is a 9mm. The 9mm can easily be converted into a 4.5 or 3mm with a barlow. Indeed, I used a 9mm with a 3X barlow to obtain my best views of Mars this year.
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