best star tracker lens

Never in a million years would someone buy the Tamron 17-35mm F/2.8-4 Di OSD for astrophotography, but I did. When it comes to astrophotography, lenses are expensive especially with wide apertures, and it’s hard to find a lens with good coma performance. I’ve used the Sony 24mm 1.4 GM for astrophotography ($1200) and the coma […]