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Sharpness comparison of Hexanon 35/2 UC LTM vs. 35 Summicron ASPH.
Old 04-04-2007   #1
awilder
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Sharpness comparison of Hexanon 35/2 UC LTM vs. 35 Summicron ASPH.

Detail evaluation of a near infinity subject revealed some interesting but not unexpected results. First, the subject full frame at f/2 with the UC.
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File Type: jpg UC-f2'-full-frame.jpg (111.3 KB, 201 views)
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Last edited by awilder : 04-04-2007 at 19:17.
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Old 04-04-2007   #2
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Now, Hexanon UC center detail at f/2, f/2.8 and f/4 from left to right.
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File Type: jpg UC-crop-f2.jpg (94.7 KB, 230 views)
File Type: jpg UC-f2.8-crop.jpg (94.0 KB, 135 views)
File Type: jpg UC-crop-f4.jpg (96.9 KB, 154 views)
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Old 04-04-2007   #3
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Now, center detail with the Summicron ASPH. at f/2, f/2.8 and f/4.
Attached Images
File Type: jpg 'cron-crop-f2.jpg (94.1 KB, 192 views)
File Type: jpg 'cron-f2.8-crop.jpg (93.2 KB, 92 views)
File Type: jpg 'cron-crop-f4.jpg (95.2 KB, 118 views)
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Last edited by awilder : 04-04-2007 at 18:46.
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Old 04-04-2007   #4
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Edge detail with the Hexanon UC at f/2 and f/4
Attached Images
File Type: jpg UC-f2-crop''.jpg (91.3 KB, 144 views)
File Type: jpg UC-f4-crop''.jpg (108.9 KB, 93 views)
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Last edited by awilder : 04-04-2007 at 18:35.
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Old 04-04-2007   #5
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Lastly, edge detail with the Summicron ASPH. at f/2 and f/4.
Attached Images
File Type: jpg 'cron-2-crop''.jpg (78.8 KB, 137 views)
File Type: jpg 'cron-crop-f4''.jpg (87.2 KB, 86 views)
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Last edited by awilder : 04-04-2007 at 18:36.
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Old 04-04-2007   #6
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The interesting thing about the Hexanon in the center shots is that focus is optimised for f/2 and stopping down progressively softens. Its most likely due to focus shift from spherical aberration (SA) where the rf cam is likely optimised for the resultant focus at f/2. The central sharpness with the Summicron is less than the Hexanon at f/2 but it progressively improves by stopping down and by f/4 indicating the lens' rf cam is optimised for optical focus at f/4 or smaller. The softness at wider apertures maybe the effect of SA induced focus shift. At f/2.8 both lenses are equally sharp indicating a kind of intersection in focus. The slightly better edge performance of the Hexanon may be due to flatter field at infinity but I have other test samples shot at 70" where the Summicron clearly is sharper in the corner than the Hexanon as seen here: http://www.photo.net/photodb/folder?folder_id=711726. The figurines are positioned slightly forward so their rf focus is an exact match to the center target focus.
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Last edited by awilder : 05-31-2007 at 09:37.
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Old 04-05-2007   #7
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I noticed a similar loss in sharpness as the Hex stopped down, and I could not explain it--I thought there might be a mistake in the posting. Thanks for the explanation.

From your samples, it looks like the Summicron has better shadow detail (she the shrubs/bushes).
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Old 04-05-2007   #8
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No mistake in the posting, I double checked. I'm 99.99% certain the loss of central sharpness is simply due to focus shift from spherical aberration as described in the excerpts from the Konica technical report on the lens seen here: http://wiki.silvergrain.org/wiki/ind...n_35mm_f.2F2.0. Except for coating differences, optically the lens is identical to the Hexar AF as evidenced by the lens' block diagrams and MTF charts.
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Last edited by awilder : 04-08-2007 at 18:54.
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Old 04-10-2007   #9
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Heck, my UC gets so sharp at f stops above 4 it hurts. I need to look into this more or perhaps i dont ; -)
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Old 04-10-2007   #10
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Interestingly, the sharpness of the Summicron and Hexanon are the same if you look at the crops shown below, right of center from the original full frame shot, both at f/4. The Summicron is the left and the Hexanon on the right.
Attached Images
File Type: jpg crop-'cron-f4'.jpg (93.3 KB, 77 views)
File Type: jpg crop-UC-f4'.jpg (93.6 KB, 77 views)
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Last edited by awilder : 04-13-2007 at 07:46.
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Old 04-10-2007   #11
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Similarly, sharpness is about the same between the two lenses at f/2 and obviously slightly softer than above. The crops are in the same order as above.
Attached Images
File Type: jpg crop-'cron-f2'.jpg (91.2 KB, 47 views)
File Type: jpg crop-UC-f2'.jpg (87.4 KB, 46 views)
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