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<blockquote data-quote="TheCROW" data-source="post: 486428" data-attributes="member: 40286">Hey guys, I need to change my Tokina 12-24 (first version) as the autofocus is acting up and I find myself needing a bit wider than 12mm on DX.I have decided on the Tokina 11-20 but it is out of stock from where I am able to get it.So if this fails I think my next logical option is the Sigma 10-20 cos the Nikon 10-24 and 12-24 are out of budget and I cannot purchase any of them used.I understand that there are 2 versions of the Sigma, the F/4 - 5.6 old version which reviews conclude is sharper than the F/3.5 which is newer.I plan on using these on my D7100 and D7200 so I need this lens to be extra sharp in order to handle that resolution and be somewhat able to handle future DX resolutions.The first version of the lens is fairly old! Do you think it is a safe bet to get it? Is it fully supported by my cameras? Or should I get the newer F3.5 model? How is the focus speed on both? I need a fast AF for sports sometimes.What do you guys think/recommend?All insights are really appreciated.</blockquote>

[QUOTE="TheCROW, post: 486428, member: 40286"] Hey guys, I need to change my Tokina 12-24 (first version) as the autofocus is acting up and I find myself needing a bit wider than 12mm on DX. I have decided on the Tokina 11-20 but it is out of stock from where I am able to get it. So if this fails I think my next logical option is the Sigma 10-20 cos the Nikon 10-24 and 12-24 are out of budget and I cannot purchase any of them used. I understand that there are 2 versions of the Sigma, the F/4 - 5.6 old version which reviews conclude is sharper than the F/3.5 which is newer. I plan on using these on my D7100 and D7200 so I need this lens to be extra sharp in order to handle that resolution and be somewhat able to handle future DX resolutions. The first version of the lens is fairly old! Do you think it is a safe bet to get it? Is it fully supported by my cameras? Or should I get the newer F3.5 model? How is the focus speed on both? I need a fast AF for sports sometimes. What do you guys think/recommend? All insights are really appreciated. [/QUOTE]

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