Friends, I posted a related request sometime back but couldn't find it
so I apologize for posting a new thread. The question is this. I'm interested in a wide, fast(ish) prime for nightscapes and astro imaging. Both Nikon and Sigma make primes in 20 and 24mm that are priced identically. The Sigma Arts are wider at 1.4, while this is the Nikon 1.8. Both are in the $700-800 range. Both get decent reviews, but I suspect both are somewhat plagued by coma. Any thoughts? Mnay thanks in advance for your expertise.