Quote:
Originally Posted by Tandum
Where do you see them at that price Merlin?
Have you tried this Ian? Looking at response curves for the default canon IR Filter, it blocks 70% of Ha at 656 and 80% of SII at 673, so your exposure time would need to be two to three times longer than with a Baader IR Filter installed plus only the red pixels will be detecting anything. I'd never get decent images if I had to do 30minute exposures.
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You have to take the response of the CCD into consideration as well. Modding the camera doesn't increase the responsiveness of the CCD at that frequency just gets rid of the filter. If you run
this document through babelfish it explains the spectral response well. There is a good argument for modding but there is more objects to imaging than just Ha regions.