Won't be long before we see the coma test heard round the world:
http://www.lenstip.com/2236-news-Sigma_A_14_mm_f_1.8_DG_HSM_-_sample_images.html
http://www.lenstip.com/2236-news-Sigma_A_14_mm_f_1.8_DG_HSM_-_sample_images.html
Sigma 14mm f/1.8 Art @ LensTip
- Thread starter ahsanford
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I sooo want to see a star field shot. The photos are pretty good but DOF makes it difficult to determine corner detail in these samples. CA is looking very minimal. So far, so good.
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Vignetting wide open is at around 2EV level, quite noticeable but expected for such a bright UWA lens. Distortions are extremely low. I detect very slight barrel type distortion. No more than 2%. Chromatic aberrations are well controlled.
So far so good.
So far so good.
BeenThere said:
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One thing I'm really liking is the low distortion. I'm about 75% sold so far.
95% of my Rokinon 14mm use is night photography. We'll see how coma plays out.
95% of my Rokinon 14mm use is night photography. We'll see how coma plays out.
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Hi tron,
Sigma 12-24 Art exhibits around 1.8% distortion level wide open and 12mm, not vignetting. So does new Sigma 14 F1.8 Art. To my eyes at least.
If you are talking vignetting , then 4EV corners vignetting is an awful lot!
or are you mixed Vignetting with distortions and EV with percents?
AFAIK, Rokinon 14 F2.4 vignetting levels are similar at 2.4EV in extreme corners but distortions are more noticeable and mustache type?
Sigma 12-24 Art exhibits around 1.8% distortion level wide open and 12mm, not vignetting. So does new Sigma 14 F1.8 Art. To my eyes at least.
If you are talking vignetting , then 4EV corners vignetting is an awful lot!
or are you mixed Vignetting with distortions and EV with percents?AFAIK, Rokinon 14 F2.4 vignetting levels are similar at 2.4EV in extreme corners but distortions are more noticeable and mustache type?
tron said:
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SecureGSM said:Yes, but this is precisely what I said : expected for such a bright UWA lens. Expected means, well, Normal, right?
Khalai said:
Check out Irix 15/2.4 lens. That thing vignettes like crazy. Almost -4 EV!
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Irix? No thanks I love my Sigmas ;D
4EV is a shame though. If that lens used (wide open) for night photography, just imaging what 4 stop shadows lift will do to the noise levels. No thank you.
4EV is a shame though. If that lens used (wide open) for night photography, just imaging what 4 stop shadows lift will do to the noise levels. No thank you.
Khalai said:SecureGSM said:Yes, but this is precisely what I said : expected for such a bright UWA lens. Expected means, well, Normal, right?
Khalai said:
Check out Irix 15/2.4 lens. That thing vignettes like crazy. Almost -4 EV!
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I meant 4EV vignetting not 4% Sorry.SecureGSM said:Hi tron,
Sigma 12-24 Art exhibits around 1.8% distortion level wide open and 12mm, not vignetting. So does new Sigma 14 F1.8 Art. To my eyes at least.
If you are talking vignetting , then 4EV corners vignetting is an awful lot!
AFAIK, Rokinon 14 F2.4 vignetting levels are similar at 2.4EV in extreme corners but distortions are more noticeable and mustache type?
tron said:
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I took the time to check the new Sigma 12-24 in lenstip. It shows very good behaviour in coma, distortion and vignetting. I am not interested in it but I just wanted to know how Sigma fares. Since they have done it once there is great hope for the new 14 1.8...
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natek said:
Um, let's see:
- Coma
- Have another look at coma
- Vignetting
- Check coma again
- A
P.S. Don't listen to me too seriously. I don't shoot astro -- I'm just parrot-ing why every superfast ultrawide has failed to meet astro shooters' (very very high) expectations the last few years: coma usually underwhelms.
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So I did some first test shots: http://striking.ch/essays/2017/07/hands-on-sigma-14mm-18/
You can download full resolution jpgs and the raw files at the end of the post.
Hoping for a clear sky to shoot some astro tonight, although I will not be able to get to a perfect location.
You can download full resolution jpgs and the raw files at the end of the post.
Hoping for a clear sky to shoot some astro tonight, although I will not be able to get to a perfect location.
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Thanks natek for your test shots.
Also found a good link for the astro folk.
Vignetting looks surprisingly good at f1.8! - probably as good or better than the Samyang XP 14mm at f2.4 (which seems to have a blue cast at the periphery when corrected).
Coma performance at f1.8 looks mixed with some shots looking reasonable and others looking a bit ordinary. This may depend on what part of the image is used to focus due to field curvature. It might be better to use stars close to the edge of the frame rather than the centre.
https://jackfusco.smugmug.com/Blog/Sigma-14mm-f18-ART-First-Images
Also found a good link for the astro folk.
Vignetting looks surprisingly good at f1.8! - probably as good or better than the Samyang XP 14mm at f2.4 (which seems to have a blue cast at the periphery when corrected).
Coma performance at f1.8 looks mixed with some shots looking reasonable and others looking a bit ordinary. This may depend on what part of the image is used to focus due to field curvature. It might be better to use stars close to the edge of the frame rather than the centre.
https://jackfusco.smugmug.com/Blog/Sigma-14mm-f18-ART-First-Images
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Thanks cazza for the link. A little hard to evaluate at the lower resolution, but definitely promising.
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