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I've noticed pale greens(mostly) and blues right from the first time I viewed it. Orion M42 was the first neb I viewed when I purchased my 10inch, it blew me away. Because it's so bright(compared with all other nebs), our eyes can see some colour. With dull objects we can only see greys. It's all to do with the rods and cones on our retina. Film and CCD cameras are alot more sensitive compared to what we see with the naked eye or even averted vision. We see these colours in M42 because it's bright, with a large aperture scope, the colour would be even better.
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