Digital BW, The Print

That shot was 1/320@f8 iso 200. In its modified form the camera is about as
sensitive as the original.

The CFA looks like it is deposited onto the sensor surface but I haven't had
a high powered microscope on it yet. I can find no references to how the
arrays are applied to the chips. I suspect that suitable solvents will
remove it.

Roger

-----Original Message-----
From: Paul D. DeRocco [mailto:pderocco@...] 
Sent: 30 July 2004 09:14
To: DigitalBlackandWhiteThePrint@yahoogroups.com
Subject: RE: [Digital BW] re: Monochrome Sensors

> From: Roger Salmon [mailto:james.salmon@...x.com]
>
> 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.

Exactly. And since you wouldn't be tossing away a third of the light in
filters, you'd get much lower noise images for regular B&W.

What kind of exposures do you need to make pictures like the one in your
link?

Also, do you know anything about how the color filters are made on cameras
like the D30, or how they might be removed?

--

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




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