I got a new lens (2nd hand but very good condition) today. The Samyang 50mm f/1.4 AS UMC lens is a fully manual lens for focus and aperture. As I will mostly be using it for astrophotography on a tracking mount for long exposures the manual operation is not a problem.
I was worried that the lens will not reach focus at infinity on f/1.4 but I tried it tonight and it can get slightly past infinity which is a good result.
This lens should be quite sharp and I look forward to testing it out in the near future. I will hopefully have some results to post here soon.