Digital BW, The Print

You're correct. The colour filter array remains. I have done this conversion
myself with a Canon D30, specifically to get IR shots. It works well IMHO.
With an 89b filter the channel sensitivities are R>G=B. Here's a recent
example:

http://www.asla81.dsl.pipex.com/IR_pictures/IR_example_1.jpg

Out of the camera the images have a magenta cast. ON the D30 sensor the CFA
appears to be deposited directly onto the sensor surface. A future project
will be to try and remove the CFA, reinstall an IR blocking filter and shoot
in B/W. Sensor resolution should then improve significantly because colour
interpolation is no longer needed.

Roger

-----Original Message-----
From: Paul D. DeRocco [mailto:pderocco@...] 
Sent: 30 July 2004 04:25
To: DigitalBlackandWhiteThePrint@yahoogroups.com
Subject: RE: [Digital BW] re: Monochrome Sensors

> From: Ray [mailto:rayweb301@...]
>
> actually they only remove the pice of filter that blocks out infra
> red, the sensor remains untouched.

So you're saying that you wind up with a color sensor with an IR pass filter
over it instead of an IR block filter? Hmmm. I'm suspicious of that, because
the home page shows a beautiful, sharp image made at ISO200, 1/60sec f11. My
DiMage 7, which has no IR block filter, requires IR exposures more like
1/6sec wide open. Furthermore, my results look noisy and not very sharp, and
only the green channel is worth a damn, which doesn't yield the nice black
skies shown in his image.

I'd gladly pay the price of a Canon 300D plus $500 if I could get it with no
Bayer filter and no IR filter, just for straight B&W.

--

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




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