So, I’ve cropped out the four corners of some images I took at infinity focus.
Here’s the full photo
Here are some magnified shot of the four corners (two at the shown 45 degree slant and two more with the opposite 45 degree slant) of an infinity focused landscape at f\2.8 and f\5.6.
From my inspection on a proper monitor even at 100% magnification the corners are clean and in focus. There is some improvement at f\5.6 but even f\2.8 is very good.
Here’s a close-up shot just to give an idea of the file look.
I’ve taken all the landscape shots at infinity focus. Trying to back off the infinity stop has not shown any focus improvement for distant objects. Because of the nature of wide angle lenses the view finder image (even at high magnification of the Sony manual focus assist) is not easily focused manually. I have used an additional 2X magnifier today to better the infinity stop setting but I think it is exactly set for infinity objects. Which is a great situation to have especially for older eyes. I’ll follow up this review with more information in the days ahead.