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Thanks - Yes I knew that the 3.5 would not get a lot of use due to the ultra high magnification on my SCT, I mainly thought it would be fun for the moon. (and also usable as a 2" 24mm eyepiece for some afocal photography)
The second lens group is somewhat dirty, and oddly seemed clearer on the moon the other night when I unscrewed them from the 1.25 barrel and reversed them! So I'm just wondering if anyone else has the same eyepiece how theirs is arranged. It seems Baader dropped it for a 5mm quite some time ago, and there are no 'exploded' views of the 3.5 I can find on the web anywhere.
I've attached another photo of how it appears at the 'top' of the negative element piece (the older pic is as it appears lookng up the 1.25 barrel)
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