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I've found collimation to be crucial for planetary work. weather it be visual or photographic. I can't speak for photographing DSOs but I hesitate to say collimation for visual DSOs....you don't need to be anywhere near as fussy for these. At least that's what I've found.
IE: I've looked at jupiter with the newt way out of collimation, & it was a terrible view....turn the scope to a glob or even M42 & I could'nt detect the difference between good collimation & cra....crummy collimation.
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