I use this lens on the Alpha 850 and it's perfect for indoor and outdoor architecture and landscapes. I should have bought this lens, not the Sony 16mm fisheye. 16mm is fun, but the distortion is only good for certain scenes, and Photoshop's distortion correction has its limitations. The 20mm focuses very quickly and sharply from f5.6. I mostly use a 24-70mm Zeiss, but the extra 4mm is really worth it for changing lenses if you can't go back far enough.
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