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Sigma YS 2.8/24mm sharpness OK?
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PostPosted: Sat May 07, 2011 4:16 pm    Post subject: Sigma YS 2.8/24mm sharpness OK? Reply with quote

Would you consider such lens as healthy? It produces really good center sharpness even wide-open but it's quickly lost toward the edges.
The hand at F4, the fence at F2.8.





PostPosted: Sat May 07, 2011 4:52 pm    Post subject: Reply with quote

Shoot to infinity, any lens is good in this distance. Sigma well deserved it's bad reputation in my experience.


PostPosted: Sat May 07, 2011 5:34 pm    Post subject: Reply with quote

I had several Sigma lenses and they all show this problem, some more some less: centre sharp, sharpness fall at the edges. Evidently they know that most people is happy when the subject (usually in the centre) is well sharp, and don't mind much about the edges. They make low cost lenses, and correction of the edges is where they obviously cut corners in the budget.


PostPosted: Sun May 15, 2011 8:52 am    Post subject: Reply with quote

It's called Sweet Spot Optic http://www.lensbaby.com/optics-sweet35.php Smile


PostPosted: Sun May 15, 2011 9:56 am    Post subject: Reply with quote

Well if the lens you mentioned is the Sigma 24mm f2.8 Super wide II, then you must be the only one on the net complaining about it......my copy is very sharp but must admit I haven't pixel peeped into the edges.


PostPosted: Sun May 15, 2011 10:06 am    Post subject: Reply with quote

Nope, earlier YS type. I was asking not complaining. Since i am not into landscape photography i like sweet spots lenses. But it would be better suited for APS-C.


PostPosted: Wed Jun 01, 2011 10:32 am    Post subject: Reply with quote

I have just found it in gallery submitted as Prakticar 2.8/24mm:

http://www.mflenses.com/gallery/v/japenese/othermaker/prakticar_24mm_f2_8

Edges soft too, but it's still pretty nice and useful.


PostPosted: Wed Jun 01, 2011 11:44 am    Post subject: Reply with quote

Might be strong plane of focus curvature.


PostPosted: Wed Jun 01, 2011 12:14 pm    Post subject: Reply with quote

Has anyone an opinion of the M42 Sigma-Z 24/2.8?
And did Sigma make the T2 Super-Albinar 24/2.8?


PostPosted: Wed Jun 01, 2011 12:23 pm    Post subject: Reply with quote

The same lens: http://www.diaplousfoto.com/catalogue/lang-en/minolta/2704-sigma-z-super-wide-24mm-28-minolta-sr.html