Originally posted by UncleVanya Do you know if the Samyang/Rokinon 135/2 is better for Astro than the d fa 100
I have familiarity with neither lens, and we have yet to hear how well the new iteration of the DFA 100mm f/2.8 ED WR will handle astrophotography* - adding exotic ED glass to a lens will have some knock on effects regarding astigmatism and coma.
While the Rokinon/Samyang 135mm f/2 has a well known reputation for being an excellent astrophotography lens. Having the autofocus WR and macro capability of the DFA100mm f/2.8 WR might allow you to do more with it.
* the old version was said to be decent - if you could get past the amount of purple fringing it suffered from.