I had the chance to compare this scope to my 4" version for a couple of weeks a few months ago. Apart what mick has mentioned about the size and mount requirements I would certainly take note of what he said about the differences in colour fringing. I found that compare to my 4" the 6" wasn't corrected as well for chromatic aberration. Compared side by side on the moon there was considerably more chromatic aberration with the 6".
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