Rather than continue to thread jack the mirrorless - fail thread I thought I'd start another one. I've been watching the discussion of the Sigma and Tamron alternatives to similar Nikon glass with considerable interest. I've also been considering a different type lens for a different purpose. I used to do a lot of wide field astro photo work back in my film days and am interested in getting into it with my D610. Although I currently have an AFS 50 f1.4, I'm thinking of picking up a manual focus, relatively fast, wide angle for that purpose. I'm considering several candidates. First, the Rokinon 24 f1.4 gets pretty good reviews for what I'm looking to do. There are also a number of older Nikkor MF lenses that look attractive as well.
From the AI- AIS catalog, the 24 f2.0 and f2.8 are possibilities, as are the 28 f2.0, the 35 f2.0, and the 35 f1.4. Most of the Nikkors can be had for substantially less to nearly the same money as the third party glass. Between the Rokinon (there's an Irix that's wider that's also a possible) and the Nikkors what would you folks recommend? Many thanks in advance.