Quote:
Originally Posted by Merlin66
A set of 2" filters will cost you about $500-600
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Where do you see them at that price Merlin?
Quote:
Originally Posted by Ian Robinson
There is no reason why narrow band Ha ,OIII and SII photography wont be successful with a DSLR , and it need not be a modded DSLR either. It's just a matter of using appropriate exposures for the camera's sensitivity in that band.
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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.