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Way back, about three or more years I think, the reflectance method gained a little discussion but pursuit of it did not seem to endure.
If it is a viable method then P+S perhaps might have not bothered with a transmissive groundglass reverse projection method.
Most of the SLR still-camera lenses used for adaptors have focal planes in the ballpark of 40mm to 47mm from the flange faces and sometimes even less from rear element or support structures to the focal plane.
This limited workspace is something builders do not have control over and some wide-angle lens types might need to be excluded as their optical properties can be affected by a simple thin piece of glass, let alone a thick prism.
The reflective material cannot be a clean surface coated mirror as it simply becomes another aerial-image device, or such a mirror with a translucent screen over it to eliminate aerial image but gain a little brightness from reflection coming back through.
Chances are use of a translucent screen layer over a mirror surface might introduce some newtonian ring effect or halation effect.
This leaves a simple plane reflective surface or a more complex material which includes some particle structures. The issue of a fixed grain pattern then comes back.
There may be an effective reflective model process. I certainly have not worked it out yet so am very open to the prospect of others getting it to function as well or better than groundglass adaptors.
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March 31st, 2008, 05:26 AM
