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

Started Apr 11, 2014 | Discussions thread
TQGroup
TQGroup Senior Member • Posts: 1,307
Re: Sigma 50mm f1.4 Art and bokeh (new pics 4/11/2014)

jtra wrote:

According to all pictures of new Sigma 50/1.4 Art I have seen, it has a very neutral bokeh (that does no mean pleasant or smooth). That is the distribution of light in out of focus highlights is very even up to their border. No pronounced edges, but no softened edges either.

Older Sigma 50/1.4 DG HSM has very smooth backround bokeh (smoother than the new one) and edgy foreground bokeh.

Of course the older is not very sharp especially in corners at large apertures (as can be seen on slrgear.com which reviewed both. New: http://slrgear.com/reviews/zproducts/sigma50f14a/zz_sampleindex.htm Old: http://slrgear.com/reviews/zproducts/sigma50f14/zz_sampleindex.htm).
But at web resolutions the sharpness does not matter, but bokeh often does.

See my article on bokeh where I explain how shperical aberration creates different types of bokeh (Sigma 50/1.4 DG HSM samples are included):
http://jtra.cz/stuff/essays/bokeh/index.html

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.

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.

Dobranoc

Andrzej

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