MTF - 24mm F2.8G
1 4 5 6 7 8 9 10 11 12

MTF - 24mm F2.8G

All three new lenses offer very high contrast across the frame wide open (left graph), indicated by the orange traces hugging the 100% (or, perfect) line for much of the frame. The 24mm is probably the standout here though, as it never dips below 90%. Stopped down (right graph) contrast is nearly perfect, but we've come to expect this of most lenses.

The 24mm is also the standout of the three lenses when it comes to center sharpness, which is at or near 95% wide open. Although the MTF curves indicate the lens sharpens up as you stop down - right up to 100% at center by F8 (right graph) - it's fairly difficult to tell in real world shooting due to how sharp the lens is at F2.8. In our aperture progression included in our sample gallery, there's a very slight increase in central sharpness going from F2.8 to F4, but by the time you reach F8 on a 60MP sensor, there's some softening due to diffraction.

While the MTF curves indicate the lens sharpens up peripherally upon stopping down, the increase in sharpness is fairly subtle (from ~70% to 80% at the edges), and visually rather difficult to discern. A likely reason for why stopping down doesn't improve resolution more significantly at the corners is the rather extreme amount of stretching that occurs at the edges to correct the high levels of distortion left behind in the optical design.

A note on reading these graphs: sagittal or radial traces are solid while tangential traces are dotted. Orange traces are for 10 lp/mm detail, often indicative of lens' contrast performance. Green traces are for 30 lp/mm detail, often indicative of lens' sharpness performance. The horizontal axis ranging from 0 - 24 at the bottom of each graph represents radial distance (mm) from the optical center of the lens, while the vertical axis represents % contrast. The higher the traces, the better.