03-21-2016, 09:07 AM
You're right, for astrophotography it doesn't matter if a lens is distorting or not - the relativity theory claims also that planets and more whole galaxies can bend the light massively, so maybe the Samyang just puts it back in to proportion 
Good luck with finding a good copy - that can happen with other manufacturers, too.
The Irix lens has a click position at infninty hwich is, nect to the fluorescent focus scale of the expensive version, another help for astro shooters. I'm just two little bits too desinterested in that kind of photography although it looks very decorative. Call me in, if we can see Martians on the pictures
Good luck with finding a good copy - that can happen with other manufacturers, too.
The Irix lens has a click position at infninty hwich is, nect to the fluorescent focus scale of the expensive version, another help for astro shooters. I'm just two little bits too desinterested in that kind of photography although it looks very decorative. Call me in, if we can see Martians on the pictures