> Date: Tue, 06 Mar 2001 13:18:40 -0500
> From: "M.J.Shupe" <[EMAIL PROTECTED]>
> Subject: Re: FD vs EOS
>
> I don't think i have seen mentioned that the coatings on the old FD
> series lenses (regular series, not SSC or L or whatever-I don't have
> experience with these FD models) were very poor compared to coatings at
> the same time by pentax, nikon, etc
Certainly not, simply because this isn't true at all.
Canon developed the Super Spectra Coating (SSC) very early,
marked a lot of the early lenses SSC and later had
that as a general feature on all lenses without explicit
marking. Coated lenses from Canon are with very few
exceptions all SSC or better.
> (I have read that this is because canon refused, or perhaps
> wasn't offerred, to license all or a portion of the SMC
> technology from pentax as nikon and other manufacturers did).
With their own coating process being very succesful,
why should they?
> Todays coatings are quite good on my L series lenses and on my 100/2.8
> usm macro. I also imagine that they are much better on the more
> consumer level lenses. Still, I recently read that they fall behind
> pentax's current coatings, but they should be much better than canon's
> lenses in the late 70's or 80s.
They are not very much different. And since Pentax sells
several lenses from Sigma relabeled "Pentax", I don't see how
Pentax could achieve better coatings....
> Also, I think we are seeing much more use of aspherics
> today, but also, much cheaper methods of producing aspherics
> (molding and plastics even) than what most likely used to
> be always ground aspherics.
The blank pressing process, first seen in Leica lenses
is in some occasions better than conventionally ground
and polished aspherics are. It depends on the shape and
size of the lens
> One other thing about new vs. old lenses. On the Schnieder website,
> they refer to several lens designs that they cannot produce anymore
> because they cannot make the same glasses. I don't know if it is
> because of environmental regulations, or what,
Yes. Those glasses can't be made anymore. Not even
Schotts experimental division will do a single melting.
> but does this lack of manufacturable glass types affect
> canon as well
Yes. Somewhere in the very early nineties you can see zoom
types mark II and mark III be made from unleaded glass,
if you look up the descriptions in Canons camera museum.
--
Michael Quack <[EMAIL PROTECTED]>
http://www.photoquack.de
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