Can we at least measure at f7.1-f9? I know few people shooting landscape at f4.
I've seen that before: I post a test showing a simple, unsurprising result and the people who do not like the result start arguing about the test conditions. Here, I got the suggestion to try zoom lenses and other apertures. When I used a zoom lens in the previous test, people complained I should have used a prime. I suppose that if I had used a smaller aperture directly, people would have argued that diffraction was a problem.
It is a simple test and it shows two simple, unsurprising facts:
-that 50 mpix is more than 34.
-that MF lenses are generally designed for higher sharpness corner to corner than lenses for the 24x36 format.
Anyway, your requirement is easy enough to meet, since I have taken pictures between f/1.4 and f/16 on that day. The f/8 picture is here
. You will have to rotate it yourself for a better comparison, it's quite easy to do in photoshop. Pictures between f/5.6 and f/16 are also available in the same stream.
Since I had tested various Nikon lenses last year, you are also welcome to have a look here
for a similar "slanted horizon" test of various Nikon lenses, at diverse focal lengths and aperture. Tell me if you find a better lens than the 35mm f/1.4.