Samyang Rokinon 24mm f/1.4 VS Sigma 20mm f/1.4 ART (Astrophotography Coma Comparison)
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- Опубліковано 16 вер 2024
- Sorry about the audio I don't have a very good mic. I couldn't find a direct comparison of these two lenses so hopefully this will help some of you out. I was getting frustrated by the lack of sharpness from the Samyang and wanted to point out the benefits of the Sigma in a direct comparison.
Thank you for the intelligent commentary. Great in depth analysis.
Also, not sure what you are seeing but Tony Northrup did a review on the sigma 20mm comparing it with the rokinon and criticized the sigma for coma. his photos showed worse coma with the sigma. The sigma is twice the price of the rokinon too. Dustin abbot also reviewed the sigma and was dissapointed with the coma performance.
Yeah, Dustin certainly didn't give the Sigma a great wrap. I don't know about Tony's review though, you could see in his exif readout his exposure time was 30 seconds. NPF rule for the Sigma on a 5DS R has max exposure at 8 seconds, even the classic 500 rule has the max at 25 seconds. I would think it would make it hard to give a solid evaluation of coma on a lens when exposure time is in star trail territory.
Thanks for digging into this, seems other reviews struggle to get past the coma and talk about things the Sigma actually does well. I decided to go with the Sigma to pair with my A7s, I figure as I'll mainly be looking to do shorter exposure time lapse and hyper lapse the overall sharpness, contrast and light gathering than moderate coma.
Glad you liked the video. I still use the Sigma for Astro and love it. Great light gathering capability-and for those that are anal about coma you can just crop to 24mm and its gone. Anyway have fun and best wishes on clear moonless nights.
I get your frustration with the manual focus. But too bad you're comparing an out of focus capture to one that's in focus... Where is the base for the comparison then. Me personally I didn't have a lot of trouble focusing with fast lenses so it would've been nice to have a comparison between two images that are in focus....
to me the samyang looks like it is focused correctly
Maybe I'm wrong... Anyways thx for the informative video 👌
@@flospectives7548 maybe I am wrong :) but i own that lens myself and you can focus it by looking for bokeh fringing. out of focus to one side is severely purple, to the other side green :D not sure if that's a positive or negative :)
Tnx for the detailed side by side comparison
Thanks for the video! :) Interesting stuff
at 4:00 in the video, I think the Sigma has more astigmatism, not coma when it's a flat line like that. But I could be wrong.
It's a combination of both, but probably more coma. The best way to test is to take a bright point source and rack focus in and out. If blur shifts 90 degrees, it's astigmatism.
1:08 Here he is describing which one is the Sigma
Imagine audio being so poor we need this kind of comments.
Wow the audio sucks! I'm sorry about that again. Quick post/19 month follow-up: The Sigma 20mm 1.4 is awesome and I have not looked back since ditching the Samyang. The Sigma 20mm 1.4 is still my #1 for astro followed by the Sigma 14mm 1.8. I do still enjoy the images and wider field of view out of the 14-24mm Nikkor and the zoom comes in handy. My advice is to not get to wrapped up in reviews. Just get what you can afford and make the best of it. High ISO tech has come so far that you can push the sensor with cheap lenses and get great results.The old Tamron and Sigma 17-35's can be found for cheap and aren't bad if coma doesn't make you lose sleep...
Thank you for this review. This appears to be the lens for photogrammetry also. Still wondering the Sigma 24mm 1.4.
Regarding audio: Just remember that no amount of audio gear will save you if you do not speak up. Imagine speaking to a class. Then position the mic to balance the level. Making these changes does not cost anything (unless maybe the neighbours will think you´re weird, talking to yourself). :)
Huh? Im totally baffled. At the very end of the video you say you passed on the sigma 14mm 1.8 prime lens because the nikon 14-24 zoom lens seems wider? The nikon is an f2.8 lol. Uh hmm...ok. So you opted for a zoom lens with nearly 2 full stops LESS light over a prime thats most certainly sharper (primes are usually like that vs zooms). Ok...good luck.
Yeah i have only heard great things about the Sigma 14mm 1.8 Art. Only beaten by the more recent Sony 14mm F1.8 GM, which is only for Sony cameras, it's still a great lens. I've got a Samyang 24mmF1.4 on the way, I plan to shoot it at F2.8 on a star tracker, i'm sure it will be sharp with no coma :)
Thank you very much!!!
Coma-shmoma 🙂. That sharpness 👍.
the sigma is on left?
No the Sigma is on the right
Some of us are hard of hearing. Your volume is impossible for me. Sorry.
I stop watching your review after you said 2:31 that you used auto focus on Sigma, ...Josh, really!?
Haha! Well for landscape astrophotography you can definitely auto-focus! Try it you'll be surprised. I live in a rural area and my D810 along with this Sigma will AF on Procyon, Sirius, or any distant light will do for landscape astro. I'll admit there have been times (not many) that AF is off and I'll manual focus. I use Betelgeuse to focus for wide field astro...it has the perfect brightness but yes you need to MF and a Bahtinov mask is a must.
is it wide open both lens?
Yes
I think thats unfair because Rokinon seems to be out of focus....
That's what I thought! But it's not...the Sigma is that much sharper.
Probably it is a bad copy. This is the number one problem this Rokinon lens...
GRJOHN360 Actually the most common issue is decentering which this lens doesn’t have. I hate to say it but the Samyang is just not sharp wide open...I’ve tried many copies.
No, my copy is the same at f/1.4, and what is interesting is if you stop down to f/2.8 it is even sharper than my Sony 24-70 f/2.8 GM. And what I understand is nightscape photography people are using this lens stopped down in f/2.8 or more where it really shines.
@ I did not know that and I've been wondering the same thing. Will try that. Then again you end up with more trailing or noise if you up time or iso...
you say it is out of focus than you claim less of sharpnes, wtf?!
Heh?