For a long time I compared 10-24 [China assembly] with a gold ring 12-24 [Japan assembly]. The difference in the picture is minimal, at a price 1,5 times lower than that of 12-24mm. Nikon has another alternative on a crop with an angle of 109 degrees simply no. Its pros: Sharp, small, light. Excellent color reproduction, focal range. Very moderately chromate compared to sigma and tokins. Nimble and accurate focus. Very good for landscapes and architecture. Has some cons High cost. Lack of stabilizer. Distortions along the frame edge in the range of 10-14 mm.
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