jwhatts wrote:
akclimber wrote
A few early season auroras from Juneau with an A7R2 and Rokinon 20/1.8 wide open.
Cheers! These are fantastic. On a side note, I don't see too many people using the Rok 20 1.8. Do you like it? Have any other astro or landscape shots to share?
Thanks! This was the first time I've used the Rok 20. I scored a great deal on it a while back and figured I'd give it a shot but the weather here has been abysmal all summer and when it's been OK I've been busy so I haven't had a chance to test it out at all. I can say from the shoot last week that wide open it's acceptably sharp but does have what I now consider the inevitable fast, wide lens coma/bats wing issue in the corners and along the edges to some extent. No better or worse than any other fast lens faster than f/2.8 shot wide open really. It's comparable to my sigma 20 f/1.4 when the Sigma is shot at f/1.6 or so. The Sigma may be better at f/1.8 but I haven't done a side by side. I tried a Nikon 20 f/1.8 and it seems similar to that as well. Of course, copy variation with Roks may make a difference for better or worse. One aspect of the lens that was a pleasant surprise is that my copy at least is dead on focused for infinity when the focus ring is turned to full stop. That makes things very easy... All-in-all, I'd say it's worth the $ if you can get one on sale. It is nice to use a native mount lens for this stuff. I plan on doing some tests and side-by-sides but it'll have to wait for some very rare clear skies :-)
Cheers!