Most manufacturers (Hoya included I believe) offer a specific model
designated 'thin mount'. Have not compared the actual performance /
specifications, but believe the designation 'thin mount' to be somewhat
arbitrary, i.e. in the eyes of the beholder. Check a couple of online
catalogues and you can glean a perspective. I use a couple of B + W,
but not sure these are more 'thin' than others offered. Can supply
URLs for filter catalogues, info, if needed. While I understand the
basic optics involved, lack a genuine academic knowledge as to the
engineering challenges in the design of the 'thin mount'. Suspect it
is both an edge problem from the height or extension of an ordinary
filter mount PLUS aberrations from thickness of the glass when used
with WA lenses. (i.e. There are two issues not necessarily linked.)
Pragmatic knowledge would help to evaluate the option oft cited of a
much larger filter size of ordinary construction with an adapter ring.
This approach does not address problems of glass thickness IF an
important consideration. Perhaps someone can supply an URL to an
astute review.
Bill
On Dec 19, 2003, at 11:24 AM, James Royall wrote:
Would a Hoya be classed as a filter with a thin mount?
James
On 19 Dec 2003, at 16:16, NSURIT@xxxxxxx wrote:
As I understand it, they polarize the light which is at a right
angle, therefore you tend to get more polarization in the center of
the picture when you have the polarizer set for maximum polarization.
This is a very unscientific explanation & I'm sure other will do a
better job. Bottom line for me is to pay to the use of the polarizer
when using a wide angle lens. You will also probably want to use a
polarizer with a thin mount. Bill Barber
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