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03-21-2012, 12:53 PM   #1
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Strange detail at fisheye 35/4,5 (solved)

Hello

Recently I bought a used fisheye for my 67. When I received it I found, taht the rear plate was bended. I tried to compllain, but finally I accepted it because it does not have any negative impact on the results.
Now I have seen an other auction of a fisheye at ebay - and saw in the pictures that it is obviously an intended detail (see photo).

Has anybod an idea what this bended disk is for?

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Last edited by klaus123; 03-23-2012 at 03:29 PM.
03-21-2012, 01:14 PM   #2
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My guess: make room for the mirror flipping up.
03-21-2012, 01:48 PM   #3
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But the bending direction is TOWARD the mirrow!
03-21-2012, 02:52 PM   #4
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I have the Pentax SMC 67 45mm F4 lens, and this lens has the same metal plate. I called my Pentax repairman about this, assuming this was the result of some kind of impact damage. He told me that this device is meant to be used for attaching gelatin filters to the back of the lens.

03-21-2012, 02:54 PM   #5
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It is a gelatin filter holder. You slide the filter under the ring behind the lens.
03-21-2012, 10:10 PM   #6
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Thank you - thats a good explenation
03-24-2012, 02:33 AM   #7
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QuoteOriginally posted by Yamanobori Quote
It is a gelatin filter holder. You slide the filter under the ring behind the lens.
Right, but they are glass filters.
You get a UV (clear), green, yellow/red and ND screw in glass filter with this lens.
Preferable you should use the lens always with a screwed in filter (mostly UV [clear]), because the optics are calculated with the filters.
With other words without a filter the optics are missing something ,)
03-24-2012, 07:55 AM   #8
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QuoteOriginally posted by veraikon Quote
Right, but they are glass filters.
You get a UV (clear), green, yellow/red and ND screw in glass filter with this lens.
Preferable you should use the lens always with a screwed in filter (mostly UV [clear]), because the optics are calculated with the filters.
With other words without a filter the optics are missing something ,)
The Pentax 6x7 35/4.5 fisheye has four built-in filters: UV, Yellow, Orange and Red. They are selected via a filter dial located near the front of the lens. If you want to use another type of filter then these would have to be gelatin and inserted in the rear holder. There are no front filter threads on this lens, so you can’t use regular glass filters.

Phil.

03-24-2012, 10:14 AM   #9
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ok, my mistake. I didnīt see the Pentax 67 - I only saw the fisheye - and with the other fisheye you have to use screw in filters , which are screwed in at the back. .

Last edited by veraikon; 03-24-2012 at 10:20 AM.
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