Re: Congratulations Canon for the 5D "Best Professional Camera" at TIPA

David J. Littleboy wrote:
"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

I see little (if ANY?) vignetting in that shot, which is encouraging.
:)

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

Strange colors present in the lower-right corner street... Is that due to
compression?
-Sort of a purplish color.
But again...an encouraging indication regarding vignetting.
:)

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.

I have that lens...but I also have the 24-70.
Have you (by some odd chance) done any comparisons between those two lenses
(24-7- and 24-105 IS)?

With the 50/1.4 wide open, most
shots look fine, but a white card looks like a disaster.

I assume that clear blue skies would also show a pronounced darkening(?).

<snip>

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'll look again (duh...)

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.

I've been wondering about that.
It seems like going much higher than 13-16MP would cause most lens corners
to struggle at FF.

Thanks for your info and samples, David.
My wallet is starting to get warm... :-O
I do wonder, though, if Canon might not come up with some sort of offering
similar to the fake "3D" mock-up...perhaps as the replacement for the 5D
with the 16MP sensor... I held out for quite a while for Canon to offer a
24-70 with IS. -Once I finally gave up and bought the 24-70, they released
the 24-105 IS. ;)
I've been interested in selling the 24-70, but if I'm close to jumping on
the 5D, I'll wait and see how they compare on a FF.

Blah blah blah.

Thanks again, David.

-Mark²


.

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