Quote:
Originally Posted by mental4astro
Here's a question along the lines of colour. Would perceived colour through a filter count? I imagine it would.
Last weekend I sent a couple of hours on M20, the Trifid Nebula, at a dark site. Using an Omega Optical OIII/Hb filter with my 17.5" dob, M20 had a definate purple colour to it. Very surprising considering purple is a colour that our eyes are not very sensitive to, and in a DSO I would have thought impossible to see. It wasn't the typical pale greenish tint seen in many bright nebulae. Very beautiful.
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Interesting question , though I'm not sure M20 is bright enough to really see colour , let alone with a filter which will dim it a lot to a narrow band . I used to think I could see the pink half but when I looked at a photo I realised that the pink half was actually the blue in real life. So much for accurate colour perception !