Premium Member Aapo Lettinen Posted March 2, 2023 Premium Member Share Posted March 2, 2023 It should be easily possible to use C-mount lenses on a D-mount camera with an adapter but finding such an adapter seems to be extremely difficult and I don't want to go through the hassle and expense of getting one custom made. It is weird nothing seems to be available for sale because this kind of adapter is very useful with 8mm cameras. The idea is to use C-mount lenses on a double8 camera for longer focal lengths and cover the wide angles with normal d-mount lenses so that I can avoid purchasing double lens sets for longer focal lengths and can make extreme telephoto shots with the 8mm cameras of very long telephoto focal lengths which are not available in d-mount. I remember seeing pictures of such adapters on old hobby camera books but cannot find anything available for sale right now. If you know some place selling them, can you link it here? Link to comment Share on other sites More sharing options...
Joerg Polzfusz Posted March 2, 2023 Share Posted March 2, 2023 Hi! I fear that you’ll have to print your own adapter: https://www.thingiverse.com/thing:2146712 1 Link to comment Share on other sites More sharing options...
Don H Marks Posted March 18 Share Posted March 18 (edited) I was looking for the same thing. Just got one on ebay here: 325678317500 Edited March 18 by Don H Marks Link to comment Share on other sites More sharing options...
Johnny Liu Posted March 31 Share Posted March 31 On 3/18/2024 at 8:50 AM, Don H Marks said: I was looking for the same thing. Just got one on ebay here: 325678317500 I just bought the same adapter off of eBay a few weeks ago. I will try to post an update once I have taken some footage using it on my Bolex B8 handheld. Link to comment Share on other sites More sharing options...
Don H Marks Posted March 31 Share Posted March 31 Mine just came today. I don't have a standard C-Mount lens to test yet, but I did measure it and it will likely work. I got these numbers off the internet, not sure how correct they are. D-mount flange focal = 12.29 C-mount flange focal = 17.526mm Difference = 5.236mm I measured the adapter and it was about 5.18mm +/- some hundreths. The lens I have in mind is the 75mm Yvar, as my Octameter has a setting for 75mm. Another I was looking at was the 3" Wollensak. Link to comment Share on other sites More sharing options...
Don H Marks Posted March 31 Share Posted March 31 This is not my picture, I found it on the internet. But it does show what I have in mind. You can see the adapter on this one is a vintage piece. Though I can't make the letters other than U.S.A Link to comment Share on other sites More sharing options...
Premium Member Simon Wyss Posted April 1 Premium Member Share Posted April 1 ELGEET Link to comment Share on other sites More sharing options...
Johnny Liu Posted April 1 Share Posted April 1 On 3/31/2024 at 4:26 PM, Don H Marks said: Mine just came today. I don't have a standard C-Mount lens to test yet, but I did measure it and it will likely work. I got these numbers off the internet, not sure how correct they are. D-mount flange focal = 12.29 C-mount flange focal = 17.526mm Difference = 5.236mm I measured the adapter and it was about 5.18mm +/- some hundreths. The lens I have in mind is the 75mm Yvar, as my Octameter has a setting for 75mm. Another I was looking at was the 3" Wollensak. Yes, I measured mine and it looks (from my calipers at least) to be correctly made. I a list of flange focal distance figures to use from this chart: https://en.wikipedia.org/wiki/Flange_focal_distance Link to comment Share on other sites More sharing options...
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