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I agree with what has been said about color in DSO's. I see predominantly greens and blues in high surface brightness planetary nebula's in my 6" scope. Pastle and rusty hues are doable in my 10" from less than perfect skies (mag 5.3-5.6 suburban Brissie skies). Andrew (astro_south) and me have seen the rusty hues in M42, both in my 10" and his 12.5". To see color you need to do away with averted vision and look straight at the object to allow the light to fall on your cones, which are sensitive to bright objects and colors. The rods that you use for night vision are useless for this. And aperture definately helps heaps with this....
Darren
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