If it isn't full frame the Tokina 11-16mm f/2.8 is not exactly cheap but is pretty good value. Image quality does drop off a bit at f/2.8 but is still OK.
If it's a full frame camera you can still use it but you will get vignetting below 13mm. I might comment further when I get the a-mount to e-mount adapter so I can use it on my Sony a7s.
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