The Nikon 400/2.8 non VR is incredibly easy to focus by comparison.Full Range Integrated Capability for maximum efficiency in a compact space It’s even sensitive by the standards of mechanically autofocused lenses. I thought all Sony lenses were focus by wire, but this focus ring is far more sensitive than you’d think it would be if the characteristics were determined by a software engineer. Many times, I’d get the focus right, only to have it shift as I removed my hand from the focusing ring. Testing note: It was very difficult to precisely focus this lens on the target. And the lens is very sharp in the circle bounded by the short dimension of the frame, where it counts with a lens like this. Considering I’ll use this lens for action and wildlife, I can’t imagine how any of the funny business we saw here in some corners would adversely affect real photographs.
I’m going to call this lens a keeper, even though it’s not perfect. More astigmatism on the upper right softer radially than tangentially. Even though is is soft sagittally, it is still sharp enough to alias the softness affects the higher contrast part of the MTF.
The image is sharp in the tangential direction but soft in the sagittal one. There’s something funny going on in the bottom right. The left is a hair sharper, but the differences are unimportant. We’ll watch that when we look at other focal lengths. Sharpness is quite respectable, and about the same for both corners.
Now I’ll go around the periphery of the frame clockwise, comparing opposite sides. I did not correct for light falloff in the corners and edges. I made all the crops at all focal lengths the same so that you can compare sharpness as a function of focal length. Crops were 477×474 pixels, and are enlarged for the web.
All images were exposed at f/5.6 and 1/3200 second, developed in Lightroom with default settings except for white balance, which was set to Daylight. Target distance for all shots was 80 meters. The test is described here.Īt 100 mm, the entire scene: 100 mm Center First thing I do these days when I get a new lens is run the Siemens Star test on it, in order to detect manufacturing errors. I’ll be reporting on it for the next week or so. Today, after a long wait, I received an FE-mount Sony 100-400 f/4.5-5.6 GM OSS lens.
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