In article <01bbfb74$ecde7280$LocalHost@bledsoe>, dbledsoeREMOVE.ME@micron.net says...

>Multi-coating on a filter is as beneficial as it is on any lens surface.
>The purpose is to reduce light reflecting from the surface thereby
>permitting a greater light throughput, which is typically followed by
>increased contrast, reduced flare, a slightly faster lens. Most quality
>lens manufactures today go to great lengths to multi-coat most air to glass
>surface within a lens. Most by now know the advantages of multi-coating
>vs. MgF coating vs. no coating. For the life of me I cannot understand why
>anyone would buy a fine multi-coated lens and then put a non-multi-coated
>filter on it to save $10 or $15 bucks.

Hmmm...;-) The transmission increase due to multi-coating vs single-coating
is minor... Theory is nice, but there is little practical difference in
images made with multicoated vs single coated lenses ("tests" in the pop
magazines and lens/filter-maker ads notwithstanding...), and even less
when comparing the two filter types (with a bow to DJ's wide-aperture-
zoom-into-the-sun photo, but usually small stops are used when shooting
the sun...;-). Remember, also, that the point of coatings is to reduce
reflection of light off the glass surface, and the outer surface of the
filter could well be left uncoated... (unless one were into the no-no
of stacking filters....;-).
Hope This Helps