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03-04-2015, 10:57 PM   #1
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Join Date: Jun 2014
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Pentax 67 TTL light metering prism is not working

It worked before. Well, I had to press the lens release button in order to activate the metering in the prism but from yesterday, it started to not working. idk why it happens. Any idea why is this happen to my camera?

03-05-2015, 12:01 AM   #2
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Join Date: Jun 2010
Location: Marina CA
Posts: 300
Take lens off. Remove prism. Put prism back on. Put lens back on. Hopefully it works. It is possible that the prism came loose and when it was pushed back on the tab on the coupling chain no longer moved the feeler on the prism. If the chain got damaged you will have to stop down meter since the part is no longer available. When the prism is removed also check the power contacts and make sure thy are clean.
03-06-2015, 08:27 AM   #3
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Location: Vancouver, Canada
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Try moving the lenses AUTO/MAN lever to MAN and see if the meter works. My TTL meter only works this way.

Note you should also look into getting a good hand held light meter, it will make your life easier!

Phil.
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645d, 645z, camera, light metering prism, medium format, pentax 67 ttl, prism, ttl light
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