Seem to be a characteristic of the lens design, maybe the volume of air
it pulls in and out in telescoping.
I had one and it was fogged on delivery.
XDan
How common is the problem with the rear element looking cloudy? Do I
have any hope of getting a good one? Is there any relation to serial
number with this defect? The only example of this lens I have ever
held had the problem - the rear element had fine specks all over it
when viewed from the front end with a light shining from the rear.
Cleaning was of no benefit. It appears to be inside - not on the
outer surface that is accessible to cleaning. The defect would not
be obvious on a casual look at the lens, so a careful inspection
seems to be required.
If a lens is OK now, what are the chances it will remain good, or do
I end up with a problem down the road?
=====
Don Shedrick
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