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Comparing the Canon 24mm f/14.L II to the Rokinon 24mm f/1.4
For this comparison, the Canon is at f/1.6 and the Rokinon is at f/1.4 to more closely match their relative brighnesses
Both images were focused manually using Live View at 10X. This part of the chart was dead center. Only the lens changed from image to image. Without moving the tripod, the Rokinon has a smaller field of view and more magnification
To me, the Rokinon has less contrast in the center than the Canon at their equivalent light gathering settings
100% crop of lower right hand side of house images
Images were processed for vignette and contrast, so ignore the differences in brightness, etc. Just interested here in the field of view
To get an idea about possible field of view or barrel distortion differences between the Canon 24mm f/1.4 and the Rokinon 24mm f/1.4, I overlayed the two shots I took the other night. For each image, I did an edge-detect filter and then used the "difference" blending mode. Look at full scale to see the deltas.
I *think* that the field of view is actually quite close at this scale. The apparent change might be due to differences in barrel distortion and the planets moving while I changed lenses.
Both images were taken at same settings with camera on a tripod that did not move