Production of good quality, finish too. The first trials in a relatively small space it is true that this objective is very good within 2 meters of the subject. If we go for landscape photos, etc ... it is poor, it is quite normal for wide angle to have distortion, lens softness ... but at this point !! It should not have the abbreviation EX. I confirm my statements by testing shop at my request to the seller of the Sigma 10-20 3.5, the Sigma 10-20 and Canon of 4-5.6 3.5-4.5 10-22. The latter two are largely better than the one presented here
