I think the notion about MC filters pops up because one wonders whether a
"flare-type of light" might be "cleaned up" by a super MC filter. I accept
it that flare can't really be cleaned up by anything, but I don't totally
understand why because I really don't understand the nature of "flare
conditions." In other words, I understand descriptions of what flare is in
a lens, but I don't really understand exactly what causes flare to happen.
Flare in a lens is an effect, not a cause, even though we sometimes talk as
though the lack of multi-coatings "causes" flare.
Joel Wilcox
Iowa City, Iowa USA
At 06:26 PM 8/13/1999 -0500, you wrote:
>As I understand it, MC simply reduces natural dispersion of glass.
>Since the ideal lens would be air that somehow coerced light into the
>proper pattern, and each piece of glass adds a little bit of
>dispersion, MC just corrects an inherent flaw. Therefore, adding a
>piece of MC glass to the front just means that it will do less damage
>than a piece of SC or uncoated glass.
>
>BBB
>
>Adding an MC filter does nothing but add another layer of glass. For MC
to >work
>properly, every element "in" the lens should be MC. It is "internal
>reflections
>inside a lens which MC coatings are intended to reduce. An MC filter on
>the outside
>can not change what is inside.
>
>Giles
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