My personal opinion is that this is a bunch of hooey. If you have an AR
coated filter (even an old one) it should be coated on both sides. AR
coatings exist primarily to reduce reflections between glass surfaces
and increase overall transmittance through the lens which, in a zoom,
can easily have 15 or more elements. The first instance of reflection
between surfaces is between your filter and the front element... digital
or no.
Chuck Norcutt
Bill Pearce wrote:
>
> I do understand that there is a difference between our old filters and ones
> designed for digital. (not something just marked digital, like a "digital"
> tripod) Apparently, the coatings on the older filters were applied mainly to
> the front surface. Now, AR coatings are applied to the back surface as well,
> as it is said that sensors are more affected but light bouncing back and
> forth between elements and the sensor than in film. Is this true? Don't ask
> me, I'm just repeating what I've read in magazines.
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