Very true unfortunately.ahsanford said:nightscape123 said:I love my Tamron 15-30. I love the wide range of wide angle options that are out there now though. In a year or 4 I might consider this lens as the price comes down. It can be a pain to lug around all the stuff I need to use filers on the tamron. However it all depends on the coma performance of this lens. My tamron is almost coma free, and canon doesn't have a great history with coma control.
If you're an astro shooter, you're kinda screwed. Wide + fast + coma free + sharp = good luck with that. So things like '"how's the AF?" or "can you thread-in filters?" become distant priorities to coma coma coma. That seems to be the back-breaker for so many f/2.8 and faster wide lenses for astro.
I joked the new Sigma 20 f/1.4 Art -- which might have a number of uses, but astro was clearly the breakthrough opportunity there -- would live or die almost entirely due to its coma performance. Turns out the coma was not great. Lens was DOA for many based on that one test.
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