Sigma 50mm f1.4 Art and bokeh (new pics 4/11/2014)

Started Apr 11, 2014 | Discussions thread
HSway
HSway Veteran Member • Posts: 3,161
Re: Sigma 50mm f1.4 Art and bokeh (new pics 4/11/2014)

jtra wrote:

TQGroup wrote:
Hi Jtra

I have read your article previously and have recommended it to friends, so now is a good time to thank you for sharing your important work.

Thank you.

As to the Sigma 50 F1.4 ART, I am not so sure that I could call its bokeh "neutral". Of course, as I've said before, it is very early days and I want to see test photos from sites I know and trust before I can confirm a definite opinion.

For example, please consider the 100% crop from a Lens Tip photo posted above in this forum: (easy link) http://www.dpreview.com/forums/post/53483220 and let me know how you would describe the bokeh highlights of the black motor car.

I am interested in your "expert" evaluation.

I based my opinion on pictures I have seen here:
http://lcap.tistory.com/entry/Sigma-50mm-f14-dg-hsm-Art-Review

Bokeh of any lens can look bad when picture is too sharpened (in camera sharpnening or raw processing can do it).

Looking at the picture you talk about (http://pliki.optyczne.pl/sig50A/sig50_fot14.JPG ), I see that bokeh is smoother near center and more edgy on image sides. You can see that on windows. Look at the windows just above statue. They are quite smooth but as you follow them to the left side, the edge of bokeh is more and more prominent. This is quite common. Older Sigma 50/1.4 DG HSM also has smoother background bokeh in about DX area than at sides.

Anyway this looks ok to me:
http://pliki.optyczne.pl/sig50A/sig50_fot07.JPG

And it is way better than Nikon 50/1.4G here:
http://pliki.optyczne.pl/nik50afs/nik50_fot11.jpg
And this is Nikon 50/1.8G:
http://pliki.optyczne.pl/nik1.8-50G_pz/DSC_3113.JPG

Comparison is the fastest way to find out, be it a known or yet unknown lens, as it illustrates the actual difference. Those mail box shots here, however useful they might be, make for rather poor comparison per se as the differences in light and the subject-to-camera distance (amount of the blur) influence the perception of bokeh.

Btw, I don’t mind the oof rendering of the 50/1.8G’s, or some other/older lenses with more structure to their technically less perfect bokeh, unlike in some other cases. Though this obviously doesn’t close the door for having one's own preferences. As we know the character of a lens isn’t possible to fit in a strictly technical description.

What I have seen so far the Sigma doesn’t look to be the instance for a generally accepted case of a bad bokeh. The lens looks more like a candidate for an average - good bokeh. - Success considering.

Otus vs Sigma mail box pics are more useful and reflect my impression of Otus being a bit smoother and creamier in the background -wide open to f2.8.

Thanks for posting this interesting link.

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