Samuli Vahonen wrote:
Are you sure? Also on sagittal detail? On tangential detail it may appear so but the 40cycles/mm sagittal is going to be very crappy even on film, not talking about thick sensor stack Sony's. On large detail even at measured f/4 on Zeiss MTF is pretty ok (10cycles/mm).
On closer distances corners will be better as lens extension makes the "bad part" of the MTF go away from image area and enlarges the "good part" of MTF to image area. The Zeiss MTFs are measured (unless otherwise stated) at infinity.
PS. Non of this corner crap & field curvature stuff isn't going to matter much if one shoots real 3D subjects. However for brickwall shooters they are very meaningful, as well as landscape shooters if there are big enough field curvature issues as they are most visible in infinity from sharpness perspective.
There is still sagittal drop at the very very tip, but the tangential does help to bring the corners to very good level. You can see a huge jump from f/4 to f/5.6.
hiepphotog wrote:
There is still sagittal drop at the very very tip, but the tangential does help to bring the corners to very good level. You can see a huge jump from f/4 to f/5.6.
Hiep, thanks for samples. I agree based on your samples that there is jump from f/4 to f/5.6 on outer zones - thou I can't see such jump in my lens except between f/2 and f/2.8, where jump is big. But I have shoot so little @ infinity, maybe 10-15 landscape photos during the time I have owned the lens (and at same time >1000 photos using mid range or close-up distances) and always @ f/5.6 or f/8, maybe not ever at any larger aperture.
The largish pixel size of A7s makes it behave differently than A7/A7r: on A7r it will remove all moire (if it ever happens) by closing down to f/16, usually even f/11 is enough to make it go away. The white roof of long building (close to top right corner) on your samples causes moire from f/5.6 to f/16 (a little already in f/4).
Enough talk on image thread; one of those 10-15 "@ infinity" photos - G45 @ f/8 (and 4 vertical photo panorama), the weird blur in center of image is threes moving due to wind)
This is the second part from today, out and about (well the first on is inside) with the family testing the lenses..
All with CV 125 and my A7..
Here is again, Ted and Todd...
Samuli, Ronny, Wilhelm, great stuff from the North! So inspiring. Your barrel, ronny, and the second shot of your trio in particular, Wilhelm, just superb!
This time, ZM 35 f:1.4, at f:2.0
philber wrote:
Charles, thanks for the encouragement, but I haven't decided to buy it yet, it is a loaner. That said, it produces some awesome results, and, the flesh being weak, mine especially so, we know which way this is headed, don't we?
This time, wide open.
You are doomed Phillipe! Might as well order your copy now so you don't have to go through withdrawal for too long after you return your loaner copy! Enjoy your Otus.
Mine spends a lot of time on my D800E.
SONY FE 24-240mm More test shots on A7s These shots are all hand held at 100 ISO. Instead of shooting 24mm and 240mm extremes I decided to look at middle ranges, maximum sharpness, maximum aperture and resulting OOF area. This is a small sampling.
Enjoy your Otus.
