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For the Sony bayonet, Sigma offers a fast 35 for 850 euros. Open, the resolution in the centre of the image could be higher. Stopping down at f/2.8 and f/5.6 gives an increase of 20 stops - the best lenses on our Sony test camera achieve another 200 stops more. At the same time, the contrast is already high at f/1.4 and increases further when stopped down. ...