Testsetup:
„Close to resolution limit“
1) EOS M100 (APS-C, 3.7µm)
2) EF 50mm f/1.4 USM
3) Cool white LED with pinhole (<0.5mm)
4) >4m Distance (iFOV <0.3mm)
The following images were processed using Paint Shop Pro 2020:
1) RAW conversion with standard settings
2) Saturation set to 0%
3) Local tonemapping (I=25, B=8)
4) Resized by 400% (without interpolation)
Results @ F/1.4 (1ms):
Results @ F/2.0 (2ms):
Results @ F/2.8 (4ms):
Results @ F/4.0 (8ms):
Summary
Imaging at F1.4 or F2.0 shows significant abberations and may only be used when point resolution is not important. F1.4 shows more vignetting.
F2.8 seems to be a good balance between integration time and resolution.
F4.0 is close to best performance in all fields (just one aperture number below diffraction limit of the camera at F/5.6)
