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As a young man, MANY years ago, I could see a definite green tint in M42
virtually any time, using a 5" Newt. As the years passed I first needed a 6" and then an 8", and now need a 10" to see even the slightest trace of green; I suppose in a few years [if I'm still around] I'll need a 12".
You can still use very low magnification with a largish scope if it has a
low enough focal ratio.
raymo
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