Does anyone have any experience/opinions on the Sigma 12-24mm f4.5-5.6 for my Sony?
How about the Sony SAL 20mm f2.8?
Or the Sigma 20mm f1.8?
For landscape.....Thanks, Matt
If you can swing it, and can live with 16mm as the widest, then the CZ 16-35 f/2.8 Vario-Sonnar is a great lens. The Sony 20mm f/2.8 is supposed to be a good performer on the A900, even though not as good a performer on APS-C bodies, strange as that seems.
The Sigma 12-24 is an imperfect beast from what I hear, due to its sample variability as stated in the above posts. However, there is nothing wider for FF in any other rectilinear lens (prime or zoom).
The below link reviews several lenses on APS-C and also on the A900 and I find to be consistent with my findings (for the most part): Click here for page