The lens is for amateur photography only. For the pros, it will fit on a clear day with a polarizing filter. Its real price should not exceed 12.000. Although there are practically no options for crop. Canon 10-22 may be a little better, but there is also no constant aperture there. And it is 6000 more expensive. Tokina 11-16 2.8 with a constant aperture, but the focal range is not so versatile and the wide angle is not so wide. And the price is different. I do not know Sigma and do not consider it.
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