This is based on my experience with one on a IS3.
It should not affect f stop, as it is in front of the lens. Some T stop
difference, of course, but not a teleconverter.
It is likely only good at the maximum FL of the lens, and likely vingnettes
at wider FL.
AF should be OK.
It is probable acceptable, but not as good as a lens of equivelent FL, but a
whole lot cheaper.
Bill Pearce, yes, he has no elk!
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