Quote:
Originally Posted by Blue Skies
AN OIII filter washes everything to green, it kind of kills any natural colour that's there.
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The green you mention, Blue, is a result of the low level of light rendering our colour vision useless. It isn't a "wash out" as such. These filters transmit the wavelengths of light that these nebulae glow at. If our eyes where more sensitive at these low levels, we would actually see red and blue - both colours our eyes are least sensative to.
If you want to see "natural" colour in nebulae, you'll need to first start with a scope larger than 16", and begin with the Orion Nebula. I've started to glimpse soft pink structures in my 17.5" in it.
You can see some faint colour in some planetary nebulae in smaller scopes, like the PN NGC 3918 the "Blue Nebula". Its distinct vivid blue is noticeable in scopes as small as 6". It isn't a large object, and something around 100X is needed to make out its disk to distinguish it from surrounding stars.