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I would be suprised if a barlow got much more detail without a lot of stacking, F/15 is pretty much bang on diffraction limiting if you have pixels around 4 micron,
I do love my Mak's however it doesnt hurt to star test them, both of mine are impressively out of collumation, to the point where I can tell from the front, after a few feild trips along not too smooth roads, (one is 6x worse than diffraction limited, the other is 8x worse from optical test charts), and am spending tonight with an artifical star trimming them in.
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