The filter pattern for Pentax (and most cameras) creates one pixel from four sensors, usually:
RG GB After thinking about this for some time, I believe that the following pattern would be better for many who would like to explore photography at wavelengths other than visible. I propose the following pattern (or something similar): RG UB Where "U" is unfiltered - like astronomy camers. Internal camera software/firmware processing would select only the RGB for normal photography and various combinations for "pseudo" filtered B&W photography - including IR & UV! The internal software/firmware would produce a "RAW" format with all four channels and provided external software would select the desired channel mix for software filtering. The camera's LCD should produce the desired output real time as selected so that the IR & UV folks can properly focus for these wavelengths. Note: for a sharp photo, one would still need IR or UV bandpass filters on their lenses or telescopes, though interesting effects such as normal RGB (in focus) and UV (slightly out of focus due to different wavelength) with an IR bandstop filter would give a reasonable facsimile of a parrot's eye view of foliage - as much as we could show it for our eyes. A lot of experimentation could ensue... What would we loose (aside from the added firmware/software/sensor filter cost? Maybe 1/3 stop. I could live with that. Regards Bob... --------------------------------------------------------------- "I don't mind if you don't like my manners. I don't like them myself. They're pretty bad. I grieve over them long winter evenings." -- Philip Marlowe (Humphrey Bogart) ----- Original Message ----- From: "Roman Melihhov" <[EMAIL PROTECTED]> > Is it possible to use Pentax K20D for IR photography without replacement > of the sensor filter glass. > > Thank you for your info. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
