They say that it is fragile and is recommended to be worn only in a hood. So I did. On a crop, the focus of this lens often smears, on a full frame everything is in order. I do not know what it is connected with. On canon 100D, one out of 10-20 shots was in focus and was sharp in the open, on 6d one out of 10-20 was out of focus. Now they sell this lens mainly because of aberrations and because there is a more compact 40 forging.
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