i recently picked up this little point and shoot cam called the arcan mf-10t(it's the yellow cam with the turtle in the polaroid shot below). i tore it apart and flipped the lens and moved the lens in front of the barrel(it wouldn't fit properly in it's regular place flipped). i just got the test roll back and the effect of the lens i'm liking(i'll post a few shots below), but i'm having some advancing problems. the first part of the roll has some very serious ovelap, this then disappears only to reaappear(but to a lesser degree) towards the end of the roll. now the overlap isn't without its charms, but i'd like to know what's causing it. any ideas?
speaking of this camera, when i got it, i posted about it on my regular blog(not my photoblog - post is
here) and how i planned to mod it, and if that failed to turn it into a pinhole camera. well, someone left this comment on that post:
The mathematics of pinhole imaging is complex. The hole diameter is dependant on both the focal length and the wavelength of the light. With a standard distance of 50mm from the lens cap to the sensor plane the optimum hole size is about .0.312 mm. This gives an f number of approx 185. It is possible to reduce the exposure time by replacing the pinhole with a Photon, or Pinhole Sieve. The former consists of a pinhole surrounded by concentric rings of decreasing width; the latter is similar but rather than concentric rings, consists of groups of concentric pinholes.. I am currently developing lenses based on these which should be available in the near future at a cost of $8-10 each, or $15-20 for a set of 3 (Pinhole, Pinhole Sieve, and Photon Sieve). Initial production will be for Canon EOS and Nikon cameras, but subject to demand, I will produce other lines as and when necessary. The body cap lens is only appropriate for film based SLR?s, having a 47 to 50mm focal length, depending on manufacturer. Most Digital SLR?s have a 24mm sensor, apart from the top of the range Canon which is 36mm. The smaller size means that to achieve the same results and perspective as a film camera the focal length needs to be reduced to approximately 33mm, a problem that I am currently working on a solution. Olympus has even smaller sensors and it would be impossible to produce a lens with the correct focal length for them. It is also possible to change the parameters of the lens to focus different wavelengths of light, e.g. daylight, infra red, ultra violet etc. This requires only a minor adjustment in the production process.that's the whole comment. it just seems so odd. it's almost like spam, but there is no url and only i can see the email address. anyway, just had to share that oddity with you all.
william
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