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08-28-2012, 11:34 AM   #1
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need help with screw mount of Pentar 135 2.8

Hello!

I just bought yesterday at a flea market in Amsterdam a Pentar 135mm F2.8, for 35. It seamed a nice bargain smooth focus, no fungus, only some marginal dust inside.

2 questions:
- Can anyone help me identify what kind of screw mount is this?
- Where can I find an adaptor to any other more conventional format?

thanks for your help!!

Tiago

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08-28-2012, 11:42 AM   #2
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The lens mount is m42,will work on Pentax Spotmatics and other cameras with stop down metering.Adapters are made so lens can be used on most popular DSLR's.
From the pictures it doesn't look like it has the auto-manual switch,if not the aperture leaver will need to be modified,easy on most of these type lens.
08-28-2012, 11:54 AM   #3
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It's looks a M42 mount lens, but it doesn't seem to have an Auto/Manual switch.
08-28-2012, 11:58 AM   #4
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Thanks for the fast replies!

It does not have any kind of switch.

08-28-2012, 11:58 AM   #5
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get am M42 mount from B&H, specifically a bower one with an inner flange to push the aperture pin up so the aperture follows the ring settings.

before using the adaptor, remove the screw and spring clip (you will understand when you see it) and any filings that are still attached to the adaptor, some of these can be a little rougn
08-28-2012, 11:38 PM   #6
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many thanks for all your help!

I'll put this lens to good use again!
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