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11-15-2011, 12:30 PM   #1
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Just when I thought I had seen it all

eBay strikes again

Pentax pinhole lens | eBay

11-15-2011, 12:41 PM   #2
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what is that for
11-15-2011, 12:44 PM   #3
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QuoteOriginally posted by sergysergy Quote
what is that for

Those are fun to play with... For a very short time though!
11-15-2011, 12:47 PM   #4
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A spare body cap, a drill, a can of coke, a sharp 'pokey thing' and some superglue will work...

11-15-2011, 12:52 PM   #5
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Heh, I have one that fits in a T-mount. Somewhere. I don't remember the last time I saw it though.
11-15-2011, 01:39 PM   #6
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I saw one of those a while back and decided it was worthless. So, fortunately I saved my money that time (didn't get it).
11-15-2011, 02:16 PM   #7
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I got one in my early eBay lens-buying frenzy. I paid more. That's a good price. It still sucks. Here is why: The focal length is the distance of the pinhole from the frame (film or sensor), so these pinhole-in-a-cap guys are about 46mm. Mine is rated as f/181, so its laser-cut hole is about 0.25mm. (A hole made with a needle is messy, giving fuzzy pictures.) Dust gets in the hole, ick. I end up with not-wide-angle pictures (46mm is short tele on APS-C) containing dust shadows, ick.

People do use such pinholes on dSLRs, but not for long. Strong points of a pinhole are its immense DOF, and its UWA capability. But neither results from mounting on a SLR -- the mirror-box pushes the pinhole too far away. We only get the UWA effect when the camera body is thin, and the 'lens' can be placed near the frame. For the thick-DOF effect, the pinhole diameter should be no larger than 1/100 the 'lens'-to-frame distance. Y'all can do the math.

Search the web and torrents for PINHOLE* and you'll find tons of info about this stuff. I still like my old oatmeal-carton camera.

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