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Re: [OM] Q on MC Filters and Flare

Subject: Re: [OM] Q on MC Filters and Flare
From: timberwolf <timberwolf@xxxxxxxxxx>
Date: Sat, 25 Jul 1998 17:54:28 +0000
>Oly Shooters:
>A while ago I asked whether MC filters might not be a solution to flare in
>SC lenses. Lee Hawkins responded without explanation that it would make
>flare worse.
>My attempt to explain this to myself takes as a given a state or situation
>in which a MC lens would not flare "*because* it is MC but a SC lens would
>flare because it *is* SC.  But SC lenses most of the time are not in a
>state of flare.  Would an MC filter *induce* flare or just exacerbate it
>when flare going to happen anyway?
>Are there any circumstances in which a MC filter would be either neutral or
>perhaps an improvement over a conventional uncoated filter with an SC lens?
>Lee, are you lurking?  Others?

It would seem to be as follows: any refracting optical element (lens,
filter etc)
does exhibit some flare. Each lens element and filter and whatnot contributes
its little bit, and then there are interactions which worsen the outcome. Now
an objective lens -- uncoated, single-coated or multicoated -- has its own
of flare. This amount is at a minimum when nothing is added in front of it (or,
God forbid, behind it). An uncoated filter adds quite a bit of flare to
this minimum.
A single-coated filter adds considerably less, and a multicoated one even
less. But
in all these cases, it is a matter of more or less addition to the minimum
of the
bare lens. I cannot imagine a situation where any kind of accessory filter
actually decrease this minimum. That would be magic.

A pola filter would of course in certain situations decrease flare if it
flare-inducing reflexes and other highlights *in the subject.* But this is
an entirely
different matter than suppressing the flare-inducing properties of the lens
Anybody who knows more about this than I?

Lars Bergquist
Timberwolf Type, 'the independent
specialist in text typefaces' - visit me at

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