My 1.4x seems to have a rubber like coating around the edge of the front
element. There might be metal underneath it, but I don't see any signs of
it. It also has a teeny-weensy, itsy-bitsy, chip on the edge of it. I know
neither when nor how the chip got there and it probably doesn't make any
significant difference. My 180/2.8 ser no 100177 also has faint marks on the
baffle - I do know when they got there. Judging by the marks, the glass
element probably just touches the baffle while the material around the
element leaves the marks on it. YMMV
Probably the 1.4X can be used with the less than 200,000 serial no. 180/2.8
most of the time. However I suspect the tiny interference may cause someone
some grief.
-jeff
----- Original Message -----
From: "Walt Wayman" <hiwayman@xxxxxxx>
> Actually, instead of the front element of the 1.4X-A hitting the baffle,
> it's only the metal ring around it that does, and it just barely touches.
> If you look closely at the baffle in my 180/2.8, Serial No. 111007*, you
> will see two teeny-weeny, itsy-bitsy, barely visible to the naked eye,
> inconsequential marks less than 1mm wide on the top and bottom edges where
> the ring has made very slight and gentle contact.
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