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The easy answer is that you should get collimation as good as you can...
The better your collimation the better your views...period.
How critical is collimation? Different question...
Good collimation is always important to get the "best" views visually or other...
The "faster" your scope the more critical it is...
I've read a comparison somewhere about how accurate is accurate enough (tolerance for sloppiness) but, I can't remember what the numbers are...
I think it was over on the Cloudy Nights website...and it gave some examples of needed accuracy for different f (ratio) scopes...
Anyway, practice makes perfect!
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