p.2 #1 · Astrophotography - Rokinon 24/1.4 vs Sigma 24/1.4 vs Sigma 20/1.4
I will say the lower weight of the Nikon 20/1.8 is tempting. And the ability to take filters helps its case as well.
The "Pepsi Challenge" scenario now sounds like the Samyang 24/1.4 vs Sigma 20/1.4 vs Nikon 20/1.8.
The Samyang may end up winning out based on lower initial cost, and low coma. Manual focus, although limiting for non-astro applications, I can live with since most of the shooting with this lens will likely be astro.
p.2 #2 · Astrophotography - Rokinon 24/1.4 vs Sigma 24/1.4 vs Sigma 20/1.4
All are good for astrophotography but the Sigma 24mm f1.4 is also going to be outstanding for general photography. The Sigma 24mm is a sharper lens than the Nikon 20mm and only $100 more than the 20mm f1.8 lens.
If you are using a 24-70mm and want something wider then the 20mm f1.8 would be a good lens to add.
p.2 #4 · Astrophotography - Rokinon 24/1.4 vs Sigma 24/1.4 vs Sigma 20/1.4
OK, to keep this thread rolling.
Let's say I do buy a Samyang/Rokinon/Bower 24/1.4 (which is the most likely outcome right now)...
What is the best way to check it for accuracy... without having to drive out to the country and take some astrophotography shots? (weather + driving makes it a bit of a faff). Is there a test pattern or "brick wall" shot I can use as a test?
I realize that just going out and shooting with it would help to determine how accurate it is. But, and advice on the subjects to shoot would be appreciated.
p.2 #5 · Astrophotography - Rokinon 24/1.4 vs Sigma 24/1.4 vs Sigma 20/1.4
I test all new lenses I buy as soon as they come. I do a couple. First is to put camera on tripod, tape a page of newspaper to the wall, take a photo at several different f-stops, and look it over. Second test to shoot a brick wall to check that the lens isn't sharper on one side of the photo than the another.
