Re: Congratulations Canon for the 5D "Best Professional Camera" at TIPA
- From: "David J. Littleboy" <davidjl@xxxxxxx>
- Date: Wed, 26 Apr 2006 15:15:07 +0900
"½ Confused" <somebody@xxxxxxxxxxxxxxxxx> wrote:
"Mark²" <mjmorgan(lowest even number here)@cox..net> wrote:
½ Confused wrote:
...
Oh, using a Canon 5D helps...
I recently got a 5D w/grid screen and a 24-70mm f2.8L lens. One huge
leap from the KIA 20D which will now be permanently attached to a
70-200 f2.8L IS lens. No more cameras, no more lenses, no more sensor
dust. Less discussion and much more imulsion... ;-)
Do you have any posted shots taken at 24mm on the 5D?
Here's 23 mm. Is that close enough? (different lens, not wide open, and
downsampled to 2.7MP, though)
http://www.pbase.com/davidjl/image/59225146
Here's a 35mm medium format lens, shifted up 12mm. (Big, oversharpened,
overcompressed file of an ugly, handheld, test shot.)
http://www.pbase.com/davidjl/image/57362779/original
I'm interested in a real-world take on vignetting...as it looks fairly
pronounced here:
http://www.ddisoftware.com/20d-5d/#ffff
If you take a real shot of a real subject, only the 24-105/4.0 at 4.0 would
be either noticable, or even slightly difficult to correct in
postprocessing. It's really amazing. With the 50/1.4 wide open, most shots
look fine, but a white card looks like a disaster.
It turns out that lens hood doesn't lock solid into place on my 24-70
like all my other lenses, and I accidentally rotated a few degrees.
(Until I go to Canon for a cleaning, a thin piece of paper in the
threads cures the problem.)
The 17-40 does that also, as I also found out the hard way the other day.
Sigh.
The problem was NOT the camera... it was the operator. (No confusion
there. Heh.) The hood was rotated, vignetting was from the flower
shape of the hood.
Same here. Sigh.
With your skill, go to a store that will let you take one outside with
your lens. You'll know one way or the other as soon as you get the CF
card home.
Or just download a couple of the examples from the Dpreview samples
gallery...
I think I'll be happy until the megapixel count gets into the 40+
range... unless something unusual happens and photography turns into a
4th occupation.
I'm thinking that 12.7MP is one of the sweet spots. I'm also thinking that
at least a 14-bit, if not a 16-bit, A/D converter would improve the dynamic
range at ISO 100.
I think that anything much over 20MP wouldn't make much sense, even in FF.
As you can see from the 20D/5D noise comparison in the page with the
vignetting examples above, shadow noise, even at low ISOs, is much better in
the 5D. Also, providing adequate resolution over the whole frame for
anything much over 20MP would be hard. Even at 12.7MP, one has to stop down
one's wide angle lenses to f/11 to sharpen up the corners.
David J. Littleboy
Tokyo, Japan
.
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