Sigma 14mm f/1.8 Art @ LensTip
- Thread starter ahsanford
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So i just updated my post with some astrophotography:
http://striking.ch/essays/
Conditions were less than optimal, we have summer right now and the city is not that far. But it should suffice to check if this lens might suit your needs.
Full resolution jpg and raw at the bottom of the post.
If you have any comments or wishes feel free. Astrophotography is absolutely not my field and I have nothing to compare the shots to.
http://striking.ch/essays/
Conditions were less than optimal, we have summer right now and the city is not that far. But it should suffice to check if this lens might suit your needs.
Full resolution jpg and raw at the bottom of the post.
If you have any comments or wishes feel free. Astrophotography is absolutely not my field and I have nothing to compare the shots to.
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natek, I detect strong decentering in your copy of the lens. hence your issues you are refering to:
1. Honestly, I found it hard to focus. When I focused in the middle of the frame, the corners were worse than that.
2. And each corner seemed to need a slightly different focus to get optimal results.
top left corner exibits a pronounced coma aberrations whilst the top right corner is less affected.
I woud strongly suggest to either replace the lens ( if available) or get the lens fixed under warranty. I am sorry. hope it helps.
1. Honestly, I found it hard to focus. When I focused in the middle of the frame, the corners were worse than that.
2. And each corner seemed to need a slightly different focus to get optimal results.
top left corner exibits a pronounced coma aberrations whilst the top right corner is less affected.
I woud strongly suggest to either replace the lens ( if available) or get the lens fixed under warranty. I am sorry. hope it helps.
natek said:
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actually, not quite correct. as this copy of the lens exibits decentering issues, you should look at the best corner available: top right corner. it is virtualy coma free! and just to be fair, let's not forget that you compare Sigma at F1.8 to Samyang at F2.4. That is nearly a full stop of a difference.
lkunl said:
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do not be alarmed, my friend. not enough meaningful data available yet. wait for lensrentals review. they do test for copy to copy variation and decentering routinely. I for one, do not believe that decentering being a "signature" issue of this lens. It should be no worse than 12-24 Art lens and that one is a very solid performer.
https://www.youtube.com/watch?v=IrZ1ngpWJc8
https://www.youtube.com/watch?v=IrZ1ngpWJc8
tron said:
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Alas, coma is not as great as hoped for, but it is within parameters that I can live with. I think that an aperture of 1.8, and vignetting of only 2 EV in the corners makes up for the slight coma shortcoming. This was confirmed to me by some star shots posted in another thread. Sharpness is also pretty good. Basically I'm sold on this lens for my Astro work at 14mm. Lenstip seems to agree, calling this lens the perfect astrophotographer's companion in the comment section of their review.
As a bonus, stopped down to f/5.6, it will make a great landscape lens. I would not hike with it though, given the weight. And I know the lack of filter options will bother some, polarizer is the only filter I use with some landscape images. Soon enough there will be an adapter from somebody.
As a bonus, stopped down to f/5.6, it will make a great landscape lens. I would not hike with it though, given the weight. And I know the lack of filter options will bother some, polarizer is the only filter I use with some landscape images. Soon enough there will be an adapter from somebody.
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chrysoberyl said:
Sure it has coma, but it's really quite low.
Personally, I'm sold. I can live with coma like this in the extreme corners at 1.8. And at 2.8 it will absolutely rule the field of astrophotography. Coma virtually inexistant (Lenstip only shows it at 2.5, but it gives an idea), under 1 stop of vignetting (!) where the Samyang (both of them) and Irix have between 3 and 4 stops.
Another great job by Sigma
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NorbR said:Sure it has coma, but it's really quite low.
Personally, I'm sold. I can live with coma like this in the extreme corners at 1.8. And at 2.8 it will absolutely rule the field of astrophotography. Coma virtually inexistant (Lenstip only shows it at 2.5, but it gives an idea), under 1 stop of vignetting (!) where the Samyang (both of them) and Irix have between 3 and 4 stops.
Another great job by Sigma
LensTip shows that the coma at f/1.8 is definitely there, but it is better than the 20mm Sigma. Enjoy your new lens!
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seriously guys...this lens is just freaking awesome, distortion control is magnificent, (at least my copy) did a pretty good job dealing with flare today as well, and the lens is SHARP
zero distortion correction here:
Sigma 14mm ART Sun Flare by Tony, on Flickr
zero distortion correction here:
Sigma 14mm ART Sun Flare by Tony, on Flickr
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