07-14-2017, 11:45 AM
Used from a reputable source is just as good as new, at about a third the price.
I go through Adorama for my used needs:
https://www.adorama.com/Used
They check carefully for things like chipped/ cracked internal glass, microscopic seperations of barrels etc. that can ruin a photo though you can't see them on the lens.
sw