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04-07-2019, 08:03 AM   #1
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Join Date: Apr 2019
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Pentax 6x7 shutter timing issue

Hi Pentax people.

I have an Asahi Pentax 6x7 and have shot with it for a year with great success. The other day I fired it at 125th and the shutter stayed open for about 10 seconds. I changed that battery and had the same issue, on further testing, at all shutter speeds the shutter opens for random times between 6 and 20 seconds (less than helpful).

I have taken the selector dial off and the casing around the dial and cleaned all the contacts (that were already really clean) and tested it and it is still having exactly the same issue.

It works fine in Bulb mode, don't know if thats helpful information...?

Has anyone had this issue, or has any helpful info that doesn't involve taking it for an undoubtedly expensive fix?

Thanks in advance

04-07-2019, 09:59 AM   #2

Join Date: Jul 2009
Location: Seattle
Posts: 8,245
Yikes. That's a weird problem indeed. It sounds like the camera needs servicing.
04-07-2019, 04:28 PM   #3
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Join Date: Nov 2011
Location: Melbourne, Australia.
Photos: Albums
Posts: 786
If we are talking about the 1969-era Asahi Pentax 6x7, just about the oldest camera in the line-up, it would be prudent to consider a full professional examination/service of the camera given its age. Problems of the type you describe are common and numerous, and often involve the mirror/shutter solenoid sticking (a simple item to service and replace) even if the contacts underneath the shutter speed dial are clean.

There are no new spare parts for any of the Pentax 6x7 / 67 cameras. Parts, as required, are taken from like-cameras. While this is handy, it introduces a cycle of redundancy and potential unreliability that could potentially lead to a daisy-chain of repairs going forward, but you really cannot be certain.

Bulb uses battery power only when it is actually engaged and the shutter has fired. When the camera is not in use, the shutter speed dial should be left on Bulb, and not a marked shutter speed. The other thing is to not leave the camera in a cocked state as this will lead to inaccurate shutter speeds.

Contact Eric at regarding service.

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645d, 645z, 6x7, camera, film, issue, medium format, mediumformat, pentax, pentax 6x7 shutter, pentax67, problem, shutter, timing
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