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Thanks Eric.
Without the ir/uv filter there is a brighter background (both red, green and blue pixel elements are transparent to IR light and so pick it up, as a pinkish background glow (probably from streetlights and the like) The sky is definately darker with the filter in place. Perhaps for some galaxies strong in IR light better results may be without the filter, but Ive shot things like NGC 5128 with a IR pass filter in place (visible light blocked) and result was dissapointing. Most emission nebulae emit almost nothing in IR either.
Perhaps also if I was in a very dark sky location better unfiltered results may be possible too.
The UHC-S filter passes some IR light if I dont use the uv/ir filter too
Scott
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