j-nord said:
Very interested now that we know 16-35iii produces too much vignetting for astro work.
I'm in the same boat, keeping an eye on this lens for astro. Do we have any info on price and availability? Haven't heard a peep since the announcement ... :-\
As for vignetting, I'll point out that the original Samyang 14mm f/2.8 was no rock star in that category, in fact, according to the TDP tests, it was very similar to the much maligned Canon 16-35L III (if anything, slightly worse):
http://www.the-digital-picture.com/Reviews/Lens-Vignetting-Test-Results.aspx?FLI=0&API=0&FLIComp=0&APIComp=0&Lens=1073&Camera=979&LensComp=1059
We'll see what Samyang did with the new Premium lens, but considering that the lens kept the same build and form factor, I wouldn't hold my breath for a great performance at an even wider aperture of 2.4. Hope I'm wrong, of course.