In regards to the acetone, you guys might be interested to know that the
ring (threaded ring that screws into the filter thread--about 2 mm thick
from the inside of the threads and about 7mm depth toward the back of
the lens) that holds the front element in the 300/4 IS L is definitely
plastic (I had to replace it so I am positive) and could possibly be
dissolved by acetone if you use it anywhere near the edges of this lens.
It does not look like the ring in the 70-200/2.8, which may be metal.
As far as telescope optics (mentioned in a different post), I would bet
that the coatings on a telescope are not made to be nearly as durable
(hard) as on a camera lens. After all the photography optics are made
to be relatively durable. I don't know about telescope optics
durability, but I doubt they are expected to be used in nasty
environments as photography equipment is (remember, the new eos stuff
comes with o-ring weather seals for cripes sake). The extra care
certainly couldn't hurt, though (with the possible exception of the acetone).
Mike
Jim Davis wrote:
> Acetone or laquer thinner will melt plastic, keep it away from lenses
> and filters. If you've got a bit of glue or something on there it might
> help, just be careful and keep it only on the glass, then follow up with
> cleaning as below.
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