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| p.2 #2 · Need opinions on Contax Zeiss 25/2.8 and 28/2 |
Samuli: Do you really find the CY 25/2.8 much worse at f/11? I had imagined myself using it mostly at f/11 to have foreground in focus, and even an occasional f/16 image.
It has nothing to do with CY 25/2.8, it's same for all quality lenses. CY 2.8/25 is quite good resisting diffraction like Makro-Planar 2/100 ZE/ZF - for example Planars tend to suffer more from diffraction (my own finding based on shooting tens of thousands images, I have not done any scientific study about it), but at the sensor size 36mm*24mm the f/11 just doesn't work for me. It's all about the quality requirements you have. I find some person rather funny, first they pixel peep and talk about 100% resolution, sharpness and other attributes and then they shoot with subpar shooting technique and f/11 (maybe even with some crop/small sensor camera)...
So if you are happy to your other lenses @ f/11 then also this one is OK. However be prepared for post processing if you intend to use small apertures; when I shoot with f/4-5.6 I can most of the time leave black levels to default (in Apple Aperture 3.0), with f/8 (and f/2.8) I need to compensate by raising black levels to ~5.0. At f/11 I can't get the contrast anymore back by black levels - you may get it working by using lower black level (e.g. 2.0) and then using contrast slider and trying to fix in PhotoShop with USM; low % (e.g. 15) and high pixel size (e.g. 25px) to get contrast back. Naturally most of the cases at f/11 you just run out of these tricks and no matter what you do, you will not get the same clarity and brilliance you would have got by shooting f/5.6.
Only lens I have found looking better @ f/11 than f/8 was Olympus OM 24mm f/2.8. All other lenses, even very poor quality M42 lenses, have been better at f/8. Almost all lenses are best at f/5.6 in 5DmkII, however I don't have slow primes and no slow zoom except Sigma 150-500, which is best at f/8. Additionally one more thing to consider is that from diffraction point of view lenses which focus extending lens system your aperture from diffraction point of view is effectively smaller (due to enlarging by extending the lens), so shooting at f/11 at minimum distance puts the effective aperture (from diffraction point of view) somewhere between f/11 and f/13.