11-04-2023, 02:30 PM
I am currently gathering information on lenses, particularly Nikon FX, Nikon Z and Sony FE, to help me decide what system to invest in. Opticallimits has been a great resource.
As for the resolution tests, there are some things I don't quite understand. First of all, the interpretation of the MTF figures seems to have changed between the older tests for Nikon FX lenses and the newer tests for Nikon Z and Sony FE lenses. For example, in the older tests a value above 2920 lw/ph was considered "very good". Today, only values above 3750 are considered "very good".
Why is that? Is it because todays cameras have a higher resolution than those 10 years ago and therefore demand higher resolution lenses?
Also, it says in the tests that "MTF results are not directly comparable across the different systems". What does that mean if I compare for example a Nikon AF-S 50mm f/1.8 G to a Sony FE 50mm 1.8? The Nikon goes up to 4000 lw/ph whereas the Sony reaches almost 5000 at f4. Does that mean the Sony is sharper at f4 or not?
As for the resolution tests, there are some things I don't quite understand. First of all, the interpretation of the MTF figures seems to have changed between the older tests for Nikon FX lenses and the newer tests for Nikon Z and Sony FE lenses. For example, in the older tests a value above 2920 lw/ph was considered "very good". Today, only values above 3750 are considered "very good".
Why is that? Is it because todays cameras have a higher resolution than those 10 years ago and therefore demand higher resolution lenses?
Also, it says in the tests that "MTF results are not directly comparable across the different systems". What does that mean if I compare for example a Nikon AF-S 50mm f/1.8 G to a Sony FE 50mm 1.8? The Nikon goes up to 4000 lw/ph whereas the Sony reaches almost 5000 at f4. Does that mean the Sony is sharper at f4 or not?