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Forum: Pentax SLR Lens Discussion
08-06-2011, 08:00 AM
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Because the lens is made in Japan, the screws are JIS type, not phillips. So, I would recommend buying JIS drivers, and not attempt to unscrew using regular philips drivers or jewellers screwdrivers. On my copy of the Zeiss 28mm 2.8, the screws were glued down, and required heating from a soldering iron to loosen up.
I guess that's reassurance that the lens has never been tampered with!
Great review though; I think I'll start using the Zeiss again to try it out, but unfortunately I tend to use a different lens I dearly love, the Leica R 35mm Summicron type 2. Trying out alt-lenses is extremely addicting - another path to the road of LBA!
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Forum: Pentax SLR Lens Discussion
05-16-2011, 01:49 PM
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I just finished one conversion myself (Distagon 28mm 2.8), using the instructions in the Leitax URL that was already posted.
The hardest part was getting the screws off as the manufacturer glued them in, so I heat up the screws with a soldering gun to help loosen them. Otherwise, everything else follows as the Leitax instructions has them.
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Forum: Pentax SLR Lens Discussion
04-06-2011, 10:41 PM
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This is the normal behaviour for adapted lenses, including the Leica R's. It is stop-down metering only in this case since the aperture lever in the R mount lens is not controlled in Pentax cameras. The only cameras that accept R-mount lenses without having to perform stop-down metering are ... the Leica R series cameras.
If you're talking about manual lenses in general, Pentax M and K mount lenses do not require stop-down metering because the green button does that for you.
If possible, focus first, stop down to meter and then shoot. It is a part of the workflow when one uses adapted lenses, but I guess one plus is permanent depth of field preview...
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