Hi Mike,
At Thursday, August 17, 2000 16:05, miaim@xxxxxxxxxxxxxx
<olympus@xxxxxxxxxxxxxxx>
spoke about *[OM] Re: reflections on reflections...* saying
> >From: "Lex Jenkins" <lexjenkins@xxxxxxxxxxx>
> >
> >I'm definitely outta my element (pun intended) where Zuikoatings are
> >concerned, but what Larry says kinda makes sense. If you see two distinctly
> >different hues reflected - rose (I guess that's what I called purple) and
> >yellow - wouldn't that qualify as multicoating? Maybe not by contemporary
> >standards, but duocoating at least. I have an older generic T-mount lens
> >that's definitely SC and reflects only yellow.
Multicoating is multiple coats on a single lens surface. Most single
coated lenses have different colour reflections from each surface to
colour balance the lens & glare.
> >
> >Lex
>
> If this topic hasn't been beaten to death, revived, strangled, beaten and
> kicked again enough, here's more points to ponder:
>
> I've got a 1950's vintage Rolleicord TLR that reflects both lavender and
> pale blue in both the taking and viewing lenses, yet there's no way that
> it's evidence of any sort of coating. Plain ole glass can reflect some
> funky colors. Optics are often seen as purplish, or bluish.
That's how the benefit of coating was discovered originally. People
found discoloured lenses reduced glare & improved the contrast of the
image. The lenses usually became discoloured because of darkroom
fumes, I think. Probably mercury?
...
Tom
------------
Tom Trottier <TomATrottier@xxxxxxxx> ICQ: 57647974
Abacurial Information Technology Consulting
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