I've been doing some simple astrophotography with a DSLR and lens with Skywatcher SA tracker. I've recently come across a Canon 300mm F4L IS on the second-hand market, and consider it a decent upgrade to my current stock with the longest lens of Samyang/Rokinon 135mm F2.
I've been searching online for reviews of this lens, but so far it seems that most reviews pertain to the non-IS version of this lens. For that, I'd like to know if anyone has experience with the IS version of this lens in astrophotography, and how you find it? Especially in terms of coma and chromatic aberration. Thank you all!