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Photo Forum / General Photo Topics / UK Photography / May 2004S-mount pinhole lens?
Hi there, Where can I buy a pinhole S-mount (M12 x 0.5) lens for use with a colour CMOS board camera? Ideally from a UK supplier but I don't mind buying from abroad. Do such things exist? Many thanks, Jack PS Sorry for posting to loads of news groups. > Hi there, > [quoted text clipped - 3 lines] > > Do such things exist? I would bet that SRB film service could make one out of a body cap. Problem is they might take months to do it.... Gordon  Signaturehttp://www.leica-gallery.net/gordon Thanks loads for suggesting these guys, Gordon. I called them but they didn't know about S-mount. But they did say that, if we could find the specs, they'd probably be able to make one up for about ?35 which is excellent. Jack > > Hi there, > > [quoted text clipped - 9 lines] > > Gordon > > Where can I buy a pinhole S-mount (M12 x 0.5) lens > > I would bet that SRB film service could make one out of a body cap. > Problem is they might take months to do it.... Why not make one yourself? We made pinhole cameras in school out of cardboard boxes, black tape and black spray paint...real high tech stuff... ;-> We used 4x5 film and got surprisingly sharp pictures. > > > Where can I buy a pinhole S-mount (M12 x 0.5) lens > > [quoted text clipped - 4 lines] > boxes, black tape and black spray paint...real high tech stuff... ;-> We used > 4x5 film and got surprisingly sharp pictures. I think the regularity of the edge of the hole makes a difference. Most pinhole lenses you buy are plastic body caps with a sheet of thin metal with a hole either drilled (or in some cases lasered) through it) This is fitted over a larger hole drilled through the body cap. Gordon The tiny hole you can make with a pin in tinfoil. > > > > Where can I buy a pinhole S-mount (M12 x 0.5) lens > > > [quoted text clipped - 13 lines] > > Gordon > > > > Where can I buy a pinhole S-mount (M12 x 0.5) lens > > > [quoted text clipped - 13 lines] > > Gordon How regular is a hole punched in a cardboard box with a pin? LOL! That's how we made ours. That worked fine for us in school but then I don't know how large you expect to be able to make your prints. Anyway my only point was since body caps are cheap it couldn't hurt to experiment. Might even be fun to mess with while you're waiting for a custom one. Is there some confusion here? A pinhole lens could also mean a glass or plastic lens that can look through a pinhole, as supplied on some CCD video cameras. Ashley Yes, you're right - I'm after the sort of lens Ashley mentioned. Jack > Is there some confusion here? > > A pinhole lens could also mean a glass or plastic lens that can look > through a pinhole, as supplied on some CCD video cameras. > > Ashley <newsgroups trimmed> > I think the regularity of the edge of the hole makes a difference. I did quite a bit of work on this for a project a few years back and you're quite right. Thickness of material used is also critical, the thinner the better to avoid internal reflections. But the most important factor is the actual size of the pinhole in relation to the "focal length" - pinhole to film/sensor distance. I've a table somewhere of the optimum sizes if anyone's interested. Scrub that, I've just found a link to a calculator: http://www.mrpinhole.com/holesize.php The method I finally came up with for making perfect pinholes of exact sizes, with negligable wall thickness was to photograph a black dot on a white background with lith film. This negative image was then used as a "virtual" pinhole with very impressive results. Sorry, I should have been more explicit. I don't want a litteral "pinhole" lens (i.e. a lens without any glass, just a small hole). I need a lens that can look through a hole no larger than about 2mm. The sort of lens used for covert cameras. Ideally the lens would have the following characteristics: * S-Mount ( M12 x 0.5 ) * colour compatible (i.e. it must have an IR filter and no chromatic aboration) * a focal length of between 3 - 6 mm * a field of view of between 50 - 90 degrees (using a 1/3" CMOS chip) Thanks, Jack > > > Where can I buy a pinhole S-mount (M12 x 0.5) lens > > [quoted text clipped - 4 lines] > boxes, black tape and black spray paint...real high tech stuff... ;-> We used > 4x5 film and got surprisingly sharp pictures. And does anyone know what lens mount the C-Cam8 uses? Thanks, Jack > Hi there, > [quoted text clipped - 9 lines] > PS > Sorry for posting to loads of news groups. |
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