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Thanks Matt;
That's useful info to have. The ones in my collection that bottomed out on the focusser were a couple of GSO/Bintel superviews. It doesn't bother me because I have since bought Pentax XWs, but it suprises me since they are a commonly recommended beginner's EP, and if they require a lot of backfocus it could be a problem.
Interestingly I have two GSO 30mm - one rebadged as Bintel and an original GSO - both have different backfocuses which would imply a difference in design even though they're supposedly the same EP.
I'll do some measurements myself when I get the chance and post some results to add to the data.
Cheers
Markus
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