Rod (correctly) wrote:

<Sure have, just about the time when the first CD audio players came on the
market some audio components were deemed digital ready :-) I would like to
see some technical side to the argument given that lens coatings are there
not for the sake of matching a lens to any film but singularly to reduce
unwanted reflections. Digital lenses as far as I can determine have there
image forming cone optimised to cover a smaller area and often offer FL
ranges not covered by regular 35mm lenses. They may also be designed to
have a longer effective secondary principal plane in order to reduce the
angle
of incidence on the sensor?>

It seems to go back to the "old" arguments of lens colour. It has been held
that the German lenses are "warmer" than the Japanese. In colour negative
films, the manufacturers have been corrected (or enhanced) the emulsion to
render the sky blue without the need of a UV filter. The reason being that
the main market is the point and shoot crowd. For that reason, my lenses are
"naked" for negative films and use a UV for transparency materials.

A lens for digital IMO is one that coverage for the smaller format and
probably unusable for 35 mm. However, a 35 mm format lens may provide too
much coverage and degrade the image due to flare.

Bob Rapp
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