Gear Talk > Third Party Manufacturers
Rokinon 14mm f/2.8
joshmurrah:
I dug through the forums here, and I didn't see a dedicated thread (there was some good info in the 12-24mm thread tho).
I'm looking into this lens mostly for astrophotography, so I can shoot a wide view of night skies, milky way mostly.
I tried this out with my 24-105 for the meteor shower last weekend, and found that I need something faster, and something wider, so the Rokinon seems to satisfy both of these needs.
I have two big questions:
1) does anyone have any experience shooting at infinity @ f/2.8 with this lens, does it have a fairly flat field of focus?
2) Has anyone had experiencing correcting the strong distortion in ACR 7? Is there a profile for a FF camera plus this lens in it that works well?
And of course, any general opinions about this lens would be great.
Thanks in advance!!
extremeinstability:
Number 2 first, I found one I believe in here: http://www.adobe.com/products/photoshop/extend.displayTab2.html#resources In the profile downloader area. There was just one for the lens. In the profile list I think it was listed as canon and not samyang/rokinon/etc. Works great to remove the crazy distortion. There so much resolution everything is still highly sharp after the correction.
I haven't tried the Milky Way yet as the real good parts aren't high up now. I wonder how well it will work as there is a lot of vignetting and light loss at F2.8. May not matter given the brighter parts of the Milky Way get put in the middle. It just has a way of not feeling like F2.8 I guess.
Edge to edge is pretty sharp at F2.8 infinity. It doesn't seem you even gain much more sharpness by stopping down than from where it starts at. But I haven't used this lens all that much yet. And my new/used 5D II also has a flange to sensor plane difference that needs fixed, but even on that it's good to go.
Brand B:
I bought one a couple of weeks ago and shot some various test shots with it (5DIII) prior to leaving on a trip, and got pretty good sharpness, but I concentrated on F5.6. Have not had a chance to do much with it at 2.8. I shot some night shots, but there is so much light pollution where I live they were't worth keeping, not a hint of the Milky Way.
I bought PTLens and am correcting the distortion externally that way, but I use Aperture. It has a plugin for LR and PS, but not for ACR. It does correct the distortion quite well though.
I hope to do some shooting with it this weekend, and will post more conclusions.
tron:
--- Quote from: extremeinstability on October 25, 2012, 10:01:18 AM ---Number 2 first, I found one I believe in here: http://www.adobe.com/products/photoshop/extend.displayTab2.html#resources In the profile downloader area. There was just one for the lens. In the profile list I think it was listed as canon and not samyang/rokinon/etc. Works great to remove the crazy distortion. There so much resolution everything is still highly sharp after the correction.
I haven't tried the Milky Way yet as the real good parts aren't high up now. I wonder how well it will work as there is a lot of vignetting and light loss at F2.8. May not matter given the brighter parts of the Milky Way get put in the middle. It just has a way of not feeling like F2.8 I guess.
Edge to edge is pretty sharp at F2.8 infinity. It doesn't seem you even gain much more sharpness by stopping down than from where it starts at. But I haven't used this lens all that much yet. And my new/used 5D II also has a flange to sensor plane difference that needs fixed, but even on that it's good to go.
--- End quote ---
Can you please get a picture of the night sky with the lens fully open and see how the stars show at the corners? If the lens has coma (which even Canon L lenses have fully open) they will look like ... seagulls!
Brand B:
FYI, price drop to $359 at B&H for this lens:
http://www.bhphotovideo.com/bnh/controller/home?sub=cpw&is=REG&Q=&A=details&O=productlist&sku=769532
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