On Thu, 22 May 2003 23:50:57 GMT, "Tony Spadaro" <tspadaro@ncmaps.rr.com> wrote:

> I think he may be talking about fog between the layers of glass. I had a

>Tiffen Pol that fogged internally, and there was nothing I could do about

>it. IT may have been ecause of the damp atmosphere - I did a lot of shooting

>in the Adirondacs that year and it was beginning to look like a rain forest.

> I now have a bunch of Tiffins I bought used about 10 years ago, none of

>which have fogged and I'm not even sure if they are sandwich designs (save

>for the pols. All Pols are sandwiches).

ALL the Tiffen filters in my collection (a surprising

number, given that I don't like Tiffen...;-) "spontaneously"

(as in, without known or obvious cause, whether on a lens,

or in a case - when stored under conditions which do not

cause problems with other filters...) fog, requiring

cleaning before use every few months to remove the haze

from the filter surfaces...

I prefer not to find that I have unintentionally used a

diffusion filter, though...;-)