gregory weisert Posted January 16, 2014 Share Posted January 16, 2014 hi, i was looking for a conversion for my zeiss 10-100mm t2 markII to s16, to use it on my blackmagic camera. do you know if the wides will still vignette? or till which focal length it will vignette? i found a company named abakus and they offer conversion. the thing i'm worried about is loosing image quality through the conversion. maybe u know something about it? and how will they make the conversion. only with an extender? hope to get some infos :) best gregory Link to comment Share on other sites More sharing options...
Philip Kral Posted January 16, 2014 Share Posted January 16, 2014 I'm not sure if it's the same lens, but I have a Zeiss 10-100mm that opens at its widest a 3.3 T stop. On my super16 film camera it vignettes up to about 75mm but is clear from then on. If it vignettes on a super16 frame I'm sure it will on a black magic. I personally use it for the farther focal lengths obviously. What mount is the lens? Link to comment Share on other sites More sharing options...
Premium Member Dom Jaeger Posted January 16, 2014 Premium Member Share Posted January 16, 2014 Abakus designed and assembled a lot of optical products for Optex, including their S16 lenses and extenders I believe, so their S16 conversion kit for the 10-100 will be first class, the same as the old Optex branded one. It's basically a 1.2X extender on the back, turning the lens into a 12-120, introducing some loss of speed (T2 becomes T2.4) but very little loss in image quality. Which Black Magic camera are you asking about? On the pocket Black Magic a 12-120 should cover without vignetting, seeing as that camera has a S16 sized sensor. On the Cinema Camera where an image circle of about 18mm is needed I tested a bunch of S16 lenses see http://www.cinematography.com/index.php?showtopic=56326 and estimated the 11-110 (the original Zeiss S16 conversion) would vignette below about 50mm. A 12-120 would presumably cover a little bit wider, but I don't have one here to test. Link to comment Share on other sites More sharing options...
gregory weisert Posted January 16, 2014 Author Share Posted January 16, 2014 i have both blackmagic cameras. but i want to use the zoom mainly on the cinema camera (2,5k) as it is my A-Cam. maybe i will call abakus to ask which image circle the conversion creats Link to comment Share on other sites More sharing options...
Jean-Louis Seguin Posted January 16, 2014 Share Posted January 16, 2014 You might want to contact Charles Pickel at Serious Gear. He does these conversions. http://www.seriousgear.com/ Jean-Louis Link to comment Share on other sites More sharing options...
Premium Member Will Montgomery Posted January 21, 2014 Premium Member Share Posted January 21, 2014 I put my 10-100 converted to 12-120 (By Charles at Serious Gear) on a projector last week and it looks like from about 24+ it would cover the Black Magic 2.5k sensor. This is at about 24mm on the zoom. Link to comment Share on other sites More sharing options...
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