I also saw the review you mentioned Chuck and I'm not sure what to think of
it. Quoting it:
"The TS-E 24mm F3.5 L II puts in a hugely impressive performance in our
studio test. Chromatic aberration is virtually nonexistent (lower than some
50mm primes), distortion is near-zero, vignetting is low and central
sharpness impressively high even wide open; the only slight concern is a
slight drop off in sharpness towards the corners at larger apertures.
Nevertheless it's rather better than the EF 16-35mm F2.8 L II, with sharper
corners and less distortion, and is no slouch even when compared to Canon's
excellent EF 24mm F1.4L USM, with slightly softer extreme corners but
notably lower CA."
The 16-9.net website says the Canon 16-35ii "easily outperformed the Olympus
18mm tested".
http://www.16-9.net/lens_tests/canon1635ii_a/c1635ii_a11.html
The Canon MTF curves for the TS-E 24mm look quite good but only go out to
22mm or so.
So is the Canon competitive to the Zuiko 24mm shift? The super wide zooms
often perform better at the short end so the Zuiko 18 being outdone by the
Canon 16-35 won't provide much help judging how important the 16-35 being
outdone by the TS-E 24 is. Apparently the TS-E having good MTF at 22mm
doesn't necessarily mean the lens is sharp there(?)
My own experience is that I would rather have a shift lens than rely on
Photoshop.
Jeff Keller
-----Original Message-----
From: Chuck Norcutt [mailto:chucknorcutt@xxxxxxxxxxxxxxxx]
Sent: Monday, July 20, 2009 5:38 PM
To: Olympus Camera Discussion
Subject: Re: [OM] [OT] Center filters
Jeff's mention of shift reminds me of a thought I had recently about the
effect of perspective correction in PhotoShop on image resolution.
Resolution goes down if you start pulling pixels apart. Those thoughts
made me contemplate maybe a PC lens was still justified. On the other
hand I happened to note DPReview's test of the new Canyon tilt/shift
24/3.5 Mk II the other day.
<http://www.dpreview.com/lensreviews/canon_24_3p5_tse_c10/>
At f/8 the test data shows that the lens resolves the the sensor limit
on the 21 MP sensor of the 5D Mk II but starts falling down rapidly
about 2/3 of the way out to the edge.
<http://www.dpreview.com/lensreviews/canon_24_3p5_tse_c10/page3.asp>
But that's with the lens unshifted. For what happens at max shift
scroll down on the same page to next graph labeled "Extended image
circle tests" which has the lens fully shifted. Here the lens performs
well in the center at f/8 and below but resolution at the edge of the
frame has typically fallen off to less than half the center value. So,
I think the question of shifting with software vs. a lens doesn't have
an easy answer. Of course, this lens tilts as well as shifts. PS
doesn't know how to do that trick yet.
Chuck Norcutt
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