Quote:
Originally Posted by technofetishism
Hmm, how bad is IR LP in the suburbs in reality, figured out a way to mount a straight CLS 1.25" filter in the imaging train without too much vignetting.
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The IR block on the CLS-CCD filter is not for LP, it's for imaging with a CCD camera or modified DSLR to prevent bloat effects. For unmodified DSLR cameras the IR block component is not necessary so a standard CLS will work fine.
M42 and nearby nebula like the running man NGC1977 is probably not the best example of the power of a nebula filter. Blue reflection nebula isn't well enhanced. However nebula strong in Ha like Eta Carina shows great enhancement.
This example taken with a 135mm lens. Left pic with no filter, right pic with a Lumicon Deep Sky filter. The Lumicon Deep Sky is very similar to the Astronomik CLS.