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At the other end of the scale, with a 4.5" reflector it's very dependendent on sky conditions. From my backyard in good skies it's easy to see as an oval glow, but very even and never a hint of structure. When the transparency goes off even a fraction it becomes quite difficult to see. With a tiny bit of skyglow, forget it - move on to M42, LOL!
Cheers -
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