RE: [Leica] Myth and anti-myth

["Austin Franklin" <darkroom@ix.netcom.com>]

I believe this bears repeating again:

> I also had the opportunity to test the surfaces of filters on an
> interferometer. Results will kill another myth. I used four different BW
> filters in several colours (not relevant for testing, but to show
> that there
> must be different batches).
> Results? Take a deep breath: NO, absolutely NO image degradation by the
> filter as all surfaces of the four filters were absolutely plane to the
> highest possible degree. At worst only one interferometer stripe for the
> experts.
> Of course secondary reflections are possible. But the commonly held notion
> that the addition of the filter adds two surfaces and by that fact should
> degrade the image quality is simply not supported by measurements.
> A well made filter in front of the lens will NOT make a drop of image
> quality!

Thanks Erwin!

BTW, it's Buffy the Vampire Slayer...not Killer, and if you really did feel
like Buffy, er, well, I'll leave that alone ;-)