Regarding the new 35/1.4, do you think CA is still there?

Started Nov 20, 2012 | Discussions
michaeli Regular Member • Posts: 219
Regarding the new 35/1.4, do you think CA is still there?

Take a look at the samples of the new 35/1.4.

http://www.sigma-photo.co.jp/english/lens/wide/35_14/#/gallery

I still can see a lot of green fringe there, especially the img_207 and img_203.

Sigma claims one of the features of new 35/1.4 is "both types of aberration have been corrected." What do you think?

Thanks.

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MOD Kendall Helmstetter Gelner Forum Pro • Posts: 20,122
There is some, but greatly reduced.

michaeli wrote:

Take a look at the samples of the new 35/1.4.

http://www.sigma-photo.co.jp/english/lens/wide/35_14/#/gallery

I still can see a lot of green fringe there, especially the img_207 and img_203.

Sigma claims one of the features of new 35/1.4 is "both types of aberration have been corrected." What do you think?

In the Sigma presentation posted from Photokina, Sigma showed CA examples from a number of different 35mm lenses... the thing about very large aperture lenses is that it's really hard to avoid CA wide open.  The newer lens did not eliminate it altogether but it substantially reduced it, and usually CA goes away very rapidly as you close down the aperture.

By corrected, I don't think they claim to mean completely.

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SigmaChrome Forum Pro • Posts: 10,214
Re: Regarding the new 35/1.4, do you think CA is still there?

No. I can't see any 'green fringing'. Most of the shots in the gallery were shot at low apertures - f1.4, 2.8, 3.2 - and don't show a huge amount of the subjects in focus. You cannot assess CA of any type - in any lens - in out of focus areas of a photograph.

To me, the shots look excellent.

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NarrBL Veteran Member • Posts: 6,135
Re: Regarding the new 35/1.4, do you think CA is still there?

The other thing you guys may want to be paying attention to is software correction of aberrations.

I was quite suitably impressed with what recent Photoshops (CS5 and CS6 now) can do, and this over the sorts of problems that show differently on great lenses (pick of litter) or poorer lenses (wide-range convenient zooms) when used on the SD1, whose color resolution can probably find the aberrations in any lens.

This lens correction can be one-button for any lens in the database, but is also quite easy to do manually for lenses that aren't (yet).

The cleanup is never perfect either, but it seems very impressive. On great lenses, great reduction of the sharp color fringes. On the convenient lenses, moving from looks-like-mess to an entirely usable, visibly fringe-free rendition at a magnification you would use practically anyway due to blur and other factors. And that usable magnification/resolution is itself markedly improved, when you don't have ghosts running through all edge areas.

Anyway, I'd give it a try. There may be less expensive or otherwise alternative software which does just as well as Photoshop; I don't think this is a 'tough' area of algorithms.

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