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08-03-2011, 09:40 PM   #1
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SMC Pentax 645 LS 75mm F2.8 & APS-C Digital

Has anyone actually used one of these on any APS-C digital cameras via an adapter? I'm just wondering if the leaf shutter will work on say a K-5? Thanks.

08-03-2011, 09:54 PM   #2
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I've got a 645 A 130 LS lens and a 645 to K mount that I've been meaning to try on the K5 (or K20 for that matter). Can't do it right now. One thing is that the 645 (film) knows it's an LS lens because of the contacts. That can't happen on the K mount as there is no communication between the lens and camera save the PC cable to the body.
08-03-2011, 09:59 PM   #3
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yes the leaf shutter will fire when used VIA the K mount adapte - the Leaf shutter fires the moment the aperture lever is depressed.
08-04-2011, 12:16 AM   #4
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I thought the leaf shutter was fired via the flash sync port? You just have to set the camera to 1/8 or slower shutter speed or something?

08-04-2011, 06:55 AM   #5
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QuoteOriginally posted by HawaiianOnline Quote
I thought the leaf shutter was fired via the flash sync port? You just have to set the camera to 1/8 or slower shutter speed or something?
the synch port on the lens is to fire the flash*, not the leaf shutter - I'm afraid you have the two confused.

yes the cameras focal plane shutter should be set to a setting slower than 1/60th

*if you have a flash connected to it, which is essential to get flash to synch with the lens leaf shutter.
08-06-2011, 12:02 PM   #6
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Thanks for the clarification!
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