Coma test for the RF 24mm f1.4L

So here is an update on my coma testing for my new RF 24mm f1.4L. I had a nice clear night yesterday and took some photos of the night sky where the entire photo was filled with stars. I then checked the stars in each corner (the lens was shot wide open at f1.4). All four corners showed virtually no coma at all. I've posted a photo below of one of the corners (all four corners showed no coma). To give you a perspective on the magnification, my hi-res display of the entire photo is 13.75" vertical. The corner was zoomed in such that 2.125" was expanded to 13.75. This gives an equivalent print for the whole uncropped photo of 87" x 132" (7.25 feet tall by 11 feet wide). Even at that magnification, I could only see the smallest possible suggestion of any coma at all. Here is the photo of the zoomed-in corner. Obviously, the attached photo is much smaller than it appears on my full screen, but you can download the corner photo at this link here. My conclusion is that at least the particular production sample that I own, shows virtually no coma at all anywhere in the photo, including the corners.

john1970 said:

A second thank you for sharing the results. I was really hoping that this lenses would do well with coma since I purchased it for low-light landscapes / nightscapes.

Click to expand...

Yes. It appears to be absolutely outstanding. I'm very pleased. I don't plan to make any 7 feet x 11 feet prints to hang on the wall, but it is good to know I could if I wanted. I should mention that the testing was done with a R5 Mk II.