I have a >1,100,000 50/1.4 with a modest scratch in the coatings of the
rear element about 2-3 mm long, closer to the center than the edge. I
got it cheap with the intention of waiting for one with a damaged front
element for a swap of elements. I took a couple of test pictures, one of
a tree against open sky to check for flare, and I don't see any effects
from the scratch. I think rear element flaws are generally much more
likely to be a problem than those on the front, but not necessarily "death".
Moose
John A. Lind wrote:
I've seen lenses with scuffed rear elements that look as if they were
dumped into a camera bag without back cap. Lenses can still be very
usable with a very small chip or tiny scratch or two near the edge of
the front element. "Cleaning marks" consisting of thousands of
microfine abrasions over an area are a Bad Thing. They generate
enormous flare, even though they may not be as noticeable in examining
the lens (dusty lenses will do the same thing). Any rear element
marks are **death** to a lens.
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