joel_orbita Posted July 23, 2010 Share Posted July 23, 2010 <p><a href="mailto:sales@crkennedy.com.au">Hi, I am desperately trying to find out what the lens image circle is for the Pentax 67 105mm 2.4 lens? I know that it shouldnt be much bigger than its designated format ( 6 x 7 ) but would love to know exactly what it is? I remember with my old Mamiya RZ that with the polaroids you shot it was a 7cm x 7cm image.. I would also like to know the image circle for the 90mm 2.8 and the 150mm 2.8? Any information that anyone could provide would be amazing!! Ok, thanks so much.</a></p> Link to comment Share on other sites More sharing options...
stemked Posted July 23, 2010 Share Posted July 23, 2010 <p>Hi Joel.<br> This is really a question for the Medium Format forum, not the Pentax 35mm forum. I'll leave this up here a few days to see if you get an answer and then move it over to that forum. I'd answer the question myself, but this is one 67 lens I personally don't own.</p> <p>Cheers,<br> Doug</p> Link to comment Share on other sites More sharing options...
tom_harvey3 Posted July 23, 2010 Share Posted July 23, 2010 <p>I believe it's just under 8 cm for most P67 lenses. Perhaps slightly larger for the 45, 55 and 75. Looking back I remember measuring the image circle of the latest version 90/2.8 at just over 8 cm.</p> Link to comment Share on other sites More sharing options...
john_lawson8 Posted July 23, 2010 Share Posted July 23, 2010 i have tested most of the Pentax 67 lenses on 6x9 film. These shots were 20min exposures of stars on a star tracker. All shots were wide open on a Mamiya Universal using a homemade adapter. The corners were only slightly darker than the 67 format shots and pretty sharp in the corners. If you are going to stop down a little then I don't think that you will have a problem. I have not scanned the shots so I can't post them. Let me know if I can help. Link to comment Share on other sites More sharing options...
sjgcit Posted July 23, 2010 Share Posted July 23, 2010 <p>The best number I've seen for this is 89mm ( diameter ).</p> <p>http://www.pentaconsix.com/p6lenstop67.htm</p> Link to comment Share on other sites More sharing options...
janne_moren Posted July 24, 2010 Share Posted July 24, 2010 It needs 89mm to cover 6x7 (actually 56x70mm), so anything below 89mm is pretty unlikely. If you have a lens, it should be fairly straightforward to measure it yourself. Link to comment Share on other sites More sharing options...
joel_orbita Posted July 24, 2010 Author Share Posted July 24, 2010 <p>Thanks for the responses, greatly appreciated! Just a quick question, does the image circle become bigger or smaller when the lens is stopped down? I am planning to shoot wide open portraits at 2.4. Ok, thanks again.</p> Link to comment Share on other sites More sharing options...
MAPAENG Posted June 20 Share Posted June 20 Hi all! This is a quite old thread but I found it with google and I wonder if anybody here have tested the image circle of Pentax 67 lenses and can share the results. Thanks! Martin Link to comment Share on other sites More sharing options...
Moto-Uno Posted July 17 Share Posted July 17 I believe you would have the answer if you looked at the previous posts . Link to comment Share on other sites More sharing options...
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