Winsor,
Your two cents turned into $ in my opinion. A good and interesting reading for
me.
Thanks mate!
Winsor Crosby wrote:
> My impression was that IF lenses arose out of the need to reduce to size
> and load on the tiny motors for autofocussing cameras and lenses. It did
> not have_anything_ to do with an inherent superiority of one system to
> produce an excellent image at the film plane. It was an engineering
> solution to the limitations of batteries and electrics. Just think about
> resting the barrel of an EF lens on a support to get a sharp image and burn
> out the little motor trying to push out the lens barrel. With IF the little
> motor can be quite small and light, housed in the lens, and the whole lens
> suddenly becomes a what some might think is a reasonable alternative to
> manual focus lenses with EF. You then have room for other motors to jiggle
> a new lens element in order to stabilize the image.
>
> I think that probably I would wonder, when given the choice, do I want to
> shoot outdoors with a manual version of an IF lens that was really designed
> for the autofocus version of the lens with its inherent compromises to be
> exceptionally light and to have extra space inside for the components that
> are not there, or would I rather have the lens elements housed in an EF
> mount that is brass or light alloy and is designed for strength and
> durability. I think that if you look around at some of the acknowledged
> best lenses where price is no object like Zeiss, Leitz, and even Oly
> supertelephoto, you will find EF. If there were any great superiority to
> IF, except for weight and power considerations in autofocus, there would be
> no EF lenses. Most, probably not all, IF manual lenses are like a base
> Chevie sedan--no power accessories and no Corvette either.
>
> My two cents.
--
Regards/
Ingemar Uvhagen
Gislaved, Sweden
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