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  1. xpatUSA

    Sigma Foveon-based Cameras

    Sigma Aizu Japan did acquire but then shut down the U.S.-based Foveon Company but, presumably, have retained their intellectual property while trying to develop a full-frame 1:1:1 "Foveon" three-layer sensor for about the last ten years to the general disappointment of Foveonistas worldwide...
  2. xpatUSA

    What is "Middle Gray"?

    Many would say "halfway between Black and White" and would leave it that. Others would say "18%" reflectance a la Gray Card. After much research lately, I find that it is whatever Chuck Norris says it is ... sorta. For example, Adams perpetrated 18% while Kodak preferred 16% ... both being...
  3. xpatUSA

    Leica Monochrom Sensor Spectral Response

    I tried and failed to find a spectral response curve for any M-Monochrom sensor today, even though it is said that Leica has published one. Anybody got a link or have a copy please? Elsewhere, a non-technical person is telling me that the sensor "measures luminance" which I find very hard to...
  4. xpatUSA

    UFO

    Pardon the composite ...
  5. xpatUSA

    Sigma SD1 Foveon no UV/IR blocker

    My street:
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