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Pancolart
Joined: 04 Feb 2008
Posts: 3690
Location: Slovenia, EU
Expire: 2013-11-18
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 Posted: Sat May 07, 2011 4:16 pm Post subject: Sigma YS 2.8/24mm sharpness OK? |
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Pancolart wrote:
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.
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Attila
Joined: 24 Feb 2007
Posts: 57852
Location: Hungary
Expire: 2025-11-18
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| Posted: Sat May 07, 2011 4:52 pm Post subject: |
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Attila wrote:
Shoot to infinity, any lens is good in this distance. Sigma well deserved it's bad reputation in my experience.
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Orio
Joined: 24 Feb 2007
Posts: 29545
Location: West Emilia
Expire: 2012-12-04
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| Posted: Sat May 07, 2011 5:34 pm Post subject: |
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Orio wrote:
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.
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Pancolart
Joined: 04 Feb 2008
Posts: 3690
Location: Slovenia, EU
Expire: 2013-11-18
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| Posted: Sun May 15, 2011 8:52 am Post subject: |
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Pancolart wrote:
It's called Sweet Spot Optic http://www.lensbaby.com/optics-sweet35.php 
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Excalibur
Joined: 19 Jul 2009
Posts: 5017
Location: UK
Expire: 2014-04-21
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| Posted: Sun May 15, 2011 9:56 am Post subject: |
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Excalibur wrote:
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.
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Canon A1, AV1, T70 & T90, EOS 300 and EOS300v, Chinon CE and CP-7M. Contax 139, Fuji STX-2, Konica Autoreflex TC, FS-1, FT-1, Minolta X-700, X-300, XD-11, SRT101b, Nikon EM, FM, F4, F90X, Olympus OM2, Pentax S3, Spotmatic, Pentax ME super, Praktica TL 5B, & BC1, , Ricoh KR10super, Yashica T5D, Bronica Etrs, Mamiya RB67 pro AND drum roll:- a Sony Nex 3
.........past gear Tele Rolleiflex and Rollei SL66.
Many lenses from good to excellent. |
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Pancolart
Joined: 04 Feb 2008
Posts: 3690
Location: Slovenia, EU
Expire: 2013-11-18
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| Posted: Sun May 15, 2011 10:06 am Post subject: |
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Pancolart wrote:
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.
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Pancolart
Joined: 04 Feb 2008
Posts: 3690
Location: Slovenia, EU
Expire: 2013-11-18
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| Posted: Wed Jun 01, 2011 10:32 am Post subject: |
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Pancolart wrote:
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.
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Cistron
Joined: 25 Feb 2011
Posts: 238
Location: London/Vienna
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| Posted: Wed Jun 01, 2011 11:44 am Post subject: |
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Cistron wrote:
Might be strong plane of focus curvature.
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RioRico
Joined: 12 Mar 2010
Posts: 1120
Location: California or Guatemala or somewhere
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| Posted: Wed Jun 01, 2011 12:14 pm Post subject: |
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RioRico wrote:
Has anyone an opinion of the M42 Sigma-Z 24/2.8?
And did Sigma make the T2 Super-Albinar 24/2.8?
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Pancolart
Joined: 04 Feb 2008
Posts: 3690
Location: Slovenia, EU
Expire: 2013-11-18
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| Posted: Wed Jun 01, 2011 12:23 pm Post subject: |
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Pancolart wrote:
The same lens: http://www.diaplousfoto.com/catalogue/lang-en/minolta/2704-sigma-z-super-wide-24mm-28-minolta-sr.html
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