Digital BW, The Print

Paul,

According to my understanding Dimage 7 has a little weaker IR blocking
filter. But IR blocking filter is definitely there.

If it is true that it has no IR blocking filter, after put on an Kodak IR
filter that passes IR but not visible light, you will get a pretty much
regular speed like shooting without the IR filter. Like in sunny weather,
you can get ISO 100, F11, 1/60 sec.

- philip


  -----Original Message-----
  From: DigitalBlackandWhiteThePrint@yahoogroups.com
[mailto:DigitalBlackandWhiteThePrint@yahoogroups.com]On Behalf Of Paul D.
DeRocco
  Sent: Wednesday, June 01, 2005 3:08 PM
  To: DigitalBlackandWhiteThePrint@yahoogroups.com
  Subject: RE: [Digital BW] digital IR conversion


  > From: John Moody
  >
  > Full conversion includes removal of the Bayer color filter array;
  > not at all
  > easy.  A filter to block the visible light as well.
  > Then, you need to process the raw files without colour
  > interpolation, for a true monochrome image.

  The Bayer filter is built onto the chip as part of the semiconductor fab
  process, so it can't just be lifted off. Although people are experimenting
  with chemical means of dissolving it, I'm not aware of anyone who's
  succeeded. But if someone does, the more obvious application would be for
  B&W photography, not just IR.

  However, even for IR there is some benefit to the Bayer pattern, because
the
  three colors not only have different visible light responses, they also
have
  different IR responses. It's simply not the case than an IR converted
  digicam will show everything in the red channel--the other two channels
also
  carry different images, providing an opportunity for bringing out
different
  features of a scene.

  For instance, my Minolta DiMage 7, which has no IR block filter, generally
  produces garbage in the blue channel when I put on my R72 filter, but two
  good but different images in the red and green channels. Not surprisingly,
  the red channel has the really dark skies, while the green channel has the
  white leaves. Choosing the proportion of these gives me some artistic
  control over the image that I wouldn't have if the sensor was monochrome.

  On the other hand, a monochrome sensor would be much sharper.

  --

  Ciao,               Paul D. DeRocco
  Paul                mailto:pderocco@...



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