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Fathoming difference between GSO superviews.
For various reasons I have 2 x 30mm GSO superviews. One is the Bintel rebranded one, and the other is straight up GSO that is likely the older of the two.
The GSO one is about an inch longer than the Bintel one, and requires a lot more backfocus. If a Pentax XW20mm is the standard, this one needs about 19 - 20mm backfocus.
I wonder if it's an earlier design or something? It says right on the barrel 'GSO Superview 30mm Wide view Five Elements'.
The Bintel one says 'Bintel 30mm Wide View 5 Elements Fully Multicoated <Taiwan>'.
Markus
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