QUOTE(plumberly @ Nov 26 2024, 05:36 PM)
I am a quantitative man, and like to quantify things to get a better perspective. Instead of me saying A is better than B, I want a quantitative/technical assessment. A problematic guy. Yes.
I am using MTF charts to compare the lenses. I have a 24-200 mm and want to compare it with 24-120 mm. 35-150 vs 150-500 mm which I already have.
There are a lot of MTF videos in YT. Check them out. The rule of thumb is an acceptable lens if its axis is 0.6 or higher when one moves away from the lens center. 1.0 = perfect.
Up to you to interpret and compare the charts.
One will warn me about 35-150 mm dropping to about 0.6 at full focal length. So why pay so much to get a lens that is not doing well? I think and hope that by reducing the aperture from F2.8 to say F8, the sharpness will be much better when using a high focal length.
I cannot believe my eyes when I see the 150-500 mm MTF charts, so nice!
Dont forget that if you close down the aperture to same f4 with the 24-120 on the 35-150 you will get improved IQ on the edges right? Hehe.
Peak sharpness across the frame on all focal length with the 35-150 is at f4-f5.6
Depending on the scene you have the option to shoot wide open or close down on a fast lens.
With slower lenses the options would be limited.