Testing 24-105 against 17-40

Started Oct 26, 2006 | Discussions thread
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Howard
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Testing 24-105 against 17-40
Oct 26, 2006

I while back I reported that I suspected that my 24-105 is soft:

http://forums.dpreview.com/forums/read.asp?forum=1029&message=20280215

Finally I had a chance to really test it. The conclusion: it is not soft. It is as sharp as my 17-40, which I always considered to be really sharp.

I tested them side-by-side rigorously -- on a 5D, with tripod, MLU, cable release, etc. and at all apertures (f/4, 5.6, 8, 11, 13), and the images displayed little difference.

On hindsight, I think it is the relentless resolution of the 5D that made me suspect the sharpness of the 24-105. I had used the 17-40 on my D60 for a couple of years, then I started using the 24-105 only on the 5D. Even though, obviously, I knew the different resolving power of the 2 cameras, but the perception when pixel-peeping is hard to overcome.

Here are the results. To save space, I am only posting the 24mm, f/8 results (all unprocessed, unsharpened, simply converted using DPP):

17-40 @ 24mm, f/8, center (EXIF shows 26mm)

24-105 @ 24mm, f/8, center

17-40 @ 24mm, f/8, corner (EXIF shows 26mm)

24-105 @ 24mm, f/8, corner

17-40 @ 24mm, f/8, resized full-frame (EXIF shows 26mm)

24-105 @ 24mm, f/8, resized full-frame

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cameras: 5D, D60, R2K
lenses: 17-40 f/4, 24-105 f/4, 100-400 f/4.5-5.6
24 f/3.5 TSE, 35 f/2, 50 f/1.4, Tamron 90 f/2.8 Macro
http://www.imagereservoir.com

 Howard's gear list:Howard's gear list
Canon EOS 5D Mark II Canon EOS 50D Canon EF 35mm f/2.0 Canon EF 50mm f/1.4 USM Canon EF 17-40mm f/4.0L USM +5 more
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