----- Original Message -----
From: "Bob Meyer" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Friday, August 26, 2005 12:52 PM
Subject: Re: EOS Advices needed for lens purchase
--- Wilber <[EMAIL PROTECTED]> wrote:
Bob, the only this that I know is that we shoot with
he 16-35 "L" f / 2.8
and I was told this and the 17-35 were both designed
for the 1.6x sensors.
So when we shoot with this on the full frame cameras
the edge distortion is
unreal- very very bad- sharp but bad.
Not true at all. The 17-35 was designed long before
digital SLRs were a significant issue. The 16-35 was
designed for 1.6x crop sensors only in the sense that
the slight extra coverage at the wide end was Canon's
first attempt to accomodate the loss of wide angle
coverage.
The problem with these lenses on full frame digitals,
if anything, has to do with the fact that they were
NOT designed for digital cameras. Both lenses perform
admirably at the corners on FILM. It's only on digital
that edge performance becomes a problem, and that has
to do with physics. Film is far more forgiving of
light hitting at a very shallow angle than are digital
sensors. The individual elements on a CCD or CMOS
sensor are happiest when light hits them from directly
in front. It's this issue that causes most of the
problems with FF sensors and wide angle lenses, not
any lack of concern about edge performance.
Bob Meyer
Well you have me on the 17-35 as I have never used the lens- just what I was
told about it. As to the 16-35 I own that lens and what I'm talking about is
on
film (1v) and on digital (1Ds) and that is distortion at the edges. Even
when all is square the lens is still slightly distorted when you run all the
was to the outer edges with the image (only on the ends not the top or
bottom of the frame- in other words the short side of the frame). Ah don't
even tilt her as it really will give you a fun house mirror look if there
are people or anything at the ends of the frame. Now when we shoot with the
D20 (as we are using more the center of the image circle) I have not
complaints about her. Really this distortion is only at the 16mm end of the
range-20mm on to 35 and it is fine.
Cheers Wilber
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