07-22-2015, 05:17 AM
AiryDiscus, I focused each lens for each aperture and each place (center and left bottom). I don't see the point in refocusing and I don't see the point in refocusing only the Nikon to a different spot - why would I want to focus it between center and corner when I want to have the corner as sharp as possible and f/2 is just not enough DoF?
According to the distance measured by the camera, the difference is 0.45 m when focused to the center and 1 m when focused at the corner. Take it with three grains of salt, because some pictures do show 0.84, 0.94 and the "app. 1 m" and the centers differ between 0.45 and 0.47 m. I admit the subject is not the easiest to focus at, even not in LIveView with a loupe. But those are my real life conditions No OLAF, no MTF chart, no brick-wall, no 17" laptop for tethered shooting. And even LiveView with remote control and mirror up is an exception. Normal conditions to me include phase AF and sometimes questionable shutter speeds.
I think the lenses all did quite well and I also think the Sigma prime is a little better in center and much better in the corner because it shows less CA. I'm aware Roger findings are a little different, but then you guys at OLAF control do a great job but not much pictures - no offense meant, of course.
According to the distance measured by the camera, the difference is 0.45 m when focused to the center and 1 m when focused at the corner. Take it with three grains of salt, because some pictures do show 0.84, 0.94 and the "app. 1 m" and the centers differ between 0.45 and 0.47 m. I admit the subject is not the easiest to focus at, even not in LIveView with a loupe. But those are my real life conditions No OLAF, no MTF chart, no brick-wall, no 17" laptop for tethered shooting. And even LiveView with remote control and mirror up is an exception. Normal conditions to me include phase AF and sometimes questionable shutter speeds.
I think the lenses all did quite well and I also think the Sigma prime is a little better in center and much better in the corner because it shows less CA. I'm aware Roger findings are a little different, but then you guys at OLAF control do a great job but not much pictures - no offense meant, of course.