Re: Can we 'twist' a digital picture to be square with the camera?

David J. Littleboy wrote:


"J. Clarke" <jclarke.usenet@xxxxxxxxxxxxxxxx> wrote:
2 wrote:
"J. Clarke" <jclarke.usenet@xxxxxxxxxxxxxxxx> :

Which misses the point. You have asserted that it was perfect. If it
was perfect then what was the nature of the improvement they sought to
make?

They found that the original design was most excellent, and it endured
through revolutions in glass technology so that it became even better.
Is
that too much for your mind to comprehend?

Get a grip on your problem, Clark, or be stuck in a place from which you
cannot grow.

I'm not the one who is holding up a 1954 design as the paragon of optical
perfection with no evidence whatsoever other than that that he pulled out
of his bunghole.

He certainly makes it sound as though he's blowing smoke, but the Biogon
design is widely respected. Not only the Zeiss 38mm, but the 65mm lens in
the Fuji GSW690 and the 43, 50, and 65mm Mamiya 7 lenses are some of the
best lenses in medium format. Light falloff is more of a problem than he
likes to admit, though.

I'm sure it's a good lens, but I still doubt that it achieves perfection.

FWIW, the design actually got _worse_ in its latest incarnation; the
inability to use leaded glass forced Zeiss to accept some compromises in
the latest version of the 38mm lens. It's still a lot better than the
(also Zeiss) 40mm Distagon (a retrofocus design), which was recently
redesigned to improve resolution at the cost of increased distortion.

These are all (except for the Mamiya and Fuji 65mm lenses) seriously
expensive lenses. Even used, the Mamiya 43 and 50mm lenses (for 6x7) are
around US$1400, and the Zeiss 38mm lens (in a body that's not much more
than a box) is around US$2500. In my experience, the 65mm Mamiya lens
easily outresolves the 5D, whatever lens you put on the 5D. But if you
want to take
pictures, a 5D with a 17-40 is a lot more practical (and goes a lot
wider) than a set of Mamiya Biogons on a Mamiya 7, and you won't notice
the difference at 13x19 (I have test prints that demonstrate this
clearly).

The issue the OP is dealing with is distortion, not resolution.

Here is a page of test results that covers some of these lenses (and a lot
of others).

http://www.hevanet.com/cperez/MF_testing.html

Which has absolutely no information about distortion.


--
--John
to email, dial "usenet" and validate
(was jclarke at eye bee em dot net)
.

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