Re: Old lenses and *ist D

[Robert Gonzalez]

Makes you wonder if sooner or later they will probably be driven by a 
linear or USM motor, with some type of feedback, like a shaft encoder or 
similar.  This would make it extremely precise and consistent.  It might 
actually be cheaper than a mechanical linkage, but it would necessitate 
a completely new interface that powered the lens.  Thats when we better 
get IS and maybe some other goodies to make it worthwhile, but it would 
still make people feel even more screwed than they do now, since it 
would be more difficult to keep any compatibility with older lenses. 
Since they would yet again force people to buy new lenses, which means 
it will probably happen at some point!

Peter Alling wrote:
It's still a mechanical linkage.  It would take statistical measurement 
of thousands of
lenses to make a determination.  In a perfect world the electronically 
controlled system
should be more accurate.  However it isn't a perfect world.

At 01:03 PM 10/13/03, you wrote:

----- Original Message -----
From: "Rob Studdert"
Subject: Re: Old lenses and *ist D
>
?
>
> General consensus appears to be to treat exposure like slide, once
saturation
> occurs it's a brick wall however generally the harder it saturates the
more
> nasty aberrations (coloured edges etc.) you'll see around the areas of
> saturation. Most digicams have more exposure latitude into the 
shadow than
> slide film however but a couple of stops short of the better print 
films.

Next question, how much more accurately (if at all) is the diaphram
controlled on an A lens rather than a K lens.
William Robb


I drink to make other people interesting.
        -- George Jean Nathan