----- Original Message -----
From: "Don Williams" <dwilli10@xxxxxxxxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Sunday, May 21, 2006 8:45 PM
Subject: [rollei_list] Re: WTB: SL66 thingies
> At 07:01 PM 5/21/2006 -0700, you wrote:
>>Peter,
>>
>>Yeah, you do 99.5 for say 11 air to glass surfaces and you
>>end up with a number that is not quite so large.
>>
>>BTW, you should tell Eric that you drive a La Salle, not a
>>DeSoto!
>>
>>Jerry
>
> Jerry,
>
> What lens design do you have in mind that has 11 air to
> glass surfaces?
>
>
>
> Don Williams
> La Jolla, CA
>
I can't answer for Jerry but there are plenty of zoom
lenses that have this many. They would be impossible without
effective anti-reflection coating.
I questioned Eric because I am curious about his source,
not because I think he is wrong. I have simply never seen a
statistic on rejection rates of lens coatings. The
technology involved is very advanced now. Thin film
deposition is used in the manufacture of electronic
components and elsewhere. Multiple anti-reflection coating
on camera lenses is fairly simple compared to some other
applications of the same or similar technology.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
---
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