Just another Canon shooter

Are you sure you are a beginner? You have a remarkably good understanding of equivalence (google: Joe photography equivalence). Some people spend years here, participate in thousands of...

And screw up the bokeh...

Check out this: http://cfile7.uf.tistory.com/original/185A4D4E5166FB750181D1, posted by Mssimo.

Shooting at f/2.8 with the Zeiss is better, too. Does this make the Zeiss an essentially f/2.8 lens?

Not true, just tried it. You would not be able to say which is f/2, and which is f/4, at least in the center.

In the bokeh comparison you posted the Canon look much better.

In the bokeh comparison you posted the Canon looks much better.

The link posted by Mssimo is much more telling than those numbers, especially the bokeh comparison. Too bad that the text is in an an image file,cannot use Google translate.

Sharpness is not an issue for either lens, the 135L included. Pretty useless test. Bokeh, color, flare, etc., is what matters.

Have you ever held one in your hand?

Have you ever held one in your hands?

DPR, the AA filter is not there just to prevent moire with repeated patterns. Please take some time and read something about sampling, the sampling theorem, and aliasing. The 2nd page of the review...

It seems that there is no Volume anamorphosis correction, like DXO Optics Pro.

Why would you use the same lens? He was clearly talking about equivalent ones.

They measure the MTF curve. Then they convert it in some unknown way to their metric. This is exactly what they do, say with 50mm on crop and 85mm on FF. Who said anything about being farther...

We are not talking about that, whatever that means. The question was why similar lenses perform better in the DXO tests on FF bodies - which they do. The explanation is - DXO measures basically...

Yes, always. The slanted edge test which DXO uses is largely independent of the shooting distance. If they used some periodic pattern, then changing the distance would require changing the spatial...

When you shoot with equivalent FL's, you do shoot from the same distance. BTW, even if you don't, the results will be comparable. Read the Imatest explanations. But this is off topic anyway.

The distance depends on the FOV, not on the format. Equivalent FL = same FOV = same distance to the same target. Note that I am talking about equivalent lenses, not about the same lens. DXO

Wrong, actually. They have one chart. When they test equivalent FL's they shoot from the same distance. There is a reason equivalence is call that way. BTW the slanted edge test does not feel the...