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03-17-2011, 02:32 PM   #1
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100mm Filters?

In hopes of getting something a bit wider for my P645N, I acquired a 6x7 Takumar 55/3.5 lens.

I know there are physically smaller options with wider FOV in the 645 lineup itself (I used to own one, 645 A 55/2.8). But this lens was fairly inexpensive, I already have the requisite adapter, and in the end I just couldn't resist this monster piece of glass

I have read online (for example here) that older military aerial photography cameras, certain movie cameras, etc. used the same huge 100mm filter thread. But it's not really clear precisely which models?

If you know of any 100mm filter thread lens models or models of cameras that came with these, please post them here and we could compile a little "database" of compatible gear.





Last edited by Dubesor; 03-17-2011 at 07:34 PM.
03-17-2011, 06:32 PM   #2
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Both KEH and B&H have some of the Pentax brand 100 mm filters in their used stock, if that's of interest to you.
03-17-2011, 07:35 PM   #3
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QuoteOriginally posted by Ron Boggs Quote
Both KEH and B&H have some of the Pentax brand 100 mm filters in their used stock, if that's of interest to you.
Couldn't find Pentax ones on B&H. KEH's choices are interesting. But it's still interesting to me to figure out which other lenses came in this unusual diameter.
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