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06-29-2016, 05:55 PM   #1
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TTL Prism

Will the Pentax 67 TTL Prism fit the older 6x7MLU camera as well?



06-29-2016, 06:09 PM   #2
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QuoteOriginally posted by ColColt Quote
Will the Pentax 67 TTL Prism fit the older 6x7MLU camera as well?

Yes it should. The only camera it wouldn't fit is the 67 II.

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06-29-2016, 06:16 PM   #3
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I thought it would but wasn't totally sure...thanks.
07-01-2016, 03:56 PM   #4
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I got the prism today and wouldn't you know it-it won't fit. It doesn't drop in as easily as the other one or lock despite both of them looking alike. The only difference is my old was has the logo "Ashai Pentax" on the front and this one is just "Pentax". Otherwise, they look identical. What a bummer.


Last edited by ColColt; 07-01-2016 at 04:18 PM.
07-01-2016, 09:16 PM   #5
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Something is not right there. The Asahi and Pentax TTLs are identical except for the logo area. Yours could have some damage preventing it from fitting right. There were a few internal, electrical differences between the two but that does not affect fit. I own both and they are interchangeable.
07-02-2016, 09:30 AM   #6
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I've looked both of them over and see nothing wrong with either of them. The old one snaps right on with no effort. The new one won't. It's raised slightly in the front prohibiting it from sitting down and locking. I've wiggled it around forward/backward and side to side to no avail.
07-02-2016, 02:56 PM   #7
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I think I've discovered the problem. The foam on the underneath side is twice as thick as one the old prism and perhaps is causing this. I looked both prisms over top to bottom and that's the only thing that stands out. I tried pushing the prism on a little harder after finding this but it still won't go.
07-02-2016, 03:04 PM   #8
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Sounds like someone wanted to put new seal foam on it but neglected to remove the old stuff first.

07-02-2016, 03:15 PM   #9
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No, there's no evidence of the old being on there. Looking at the foam from the side in comparison to the old one it's just thicker but looks the same otherwise.
07-03-2016, 09:35 AM   #10
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If it's just a matter of thicker foam, maybe you need to push harder to seat it? Older foam can become so thin that the prism is a bit loose on the body and no force at all is required to snap the prism into place - that's not how it's supposed to be, though I don't believe it causes any harm.

Sterling
07-03-2016, 09:45 AM   #11
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I've tried pushing harder to no avail. Maybe if I try to compress the foam and keep trying? I've never had a prism so tight as this. It's obvious the foam is new being twice the thickness as my other prism.

UPDATE-I finally achieved success. I kept compressing the foam and pushed as hard as it would go and it finally locked. I took it outside and the meter is spot on with two other meters I have. I'm gong to leave that prism on the camera a couple days and hopefully it will be easier if I have to use it again.

Last edited by ColColt; 07-03-2016 at 10:00 AM.
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