Bill, you have a 8mm lens f3.3 and a C-mount camera? I was talking about putting cine lenses reversed on 35mm and larger cameras. It may still interest you (and others) to get some details on home-made adapters.
But first of all, to do some nice macro, the preferred focal is the normal one (around 25mm for C-mount and 13mm for 8mm). Your 8mm is wide angle and not recommended. I guess a slight tele like 36mm in C-mount would also work fine with a bit less magnification. I'll experiment with this in september or later and eventually post more details. For the reversed adapter, you ask a machinist to make a hole in the cap of the cine lens (you need it!), you glue it with epoxy in the center of a 42mm plastic body cap that has a hole the same dimension and voila! You have a home-made reverse adapter for lenses with this odd filter size. You need to put the adapter on a screw mount bellows or tube (or any bellows that take a screw adapter). But first you have to find a good cine lens. Andre >Andre, > >Interesting idea! I never though of putting one of these lenses >reversed on ANYTHING, much less a 6x7. Let me know how your >homemade adapter works, I'd definitly be interested. > >It's definitly a C mount lens, and a C mount camera. No way to >change lens flange or anything. > The lens in question is a 3.3-8 mm lens. I am now BELIEVE that the lens is meant to mount close to some other ocular device; such as a microscope or telescope. I'm going to put it away for further use later. IL Bill andre wrote: >>By the way, it may interest you to know that you can use 8mm and >>16mm cine lenses REVERSED for Triple-X macros (the pun is for >>lilliputians). I mean 3X and over. If this is the case, you can >>vary the distance of the lens from the film plane with a bellow >>(and easily cover full frame on a Pentax 67), but the distance of >>the subject to the front of the lens (well... we could say the back >>as the lens is reversed) should not go over the distance between a >>16mm cine lens and the 16mm film in a 16mm camera. This if you >>want the best optical quality. >> >>I don't know if this is clear... and if it may interest some >>PDMLers. I've got the theory (some...), I've acquired a few lenses >>recently, I'm actually working on some home-made adapters... the >>practice will follow within a few months I hope. >> >>Andre -- - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
