It is very compact (less than 10 cm), not heavy (540 grams), well finished, discreet and comes with the sun visor. The 16 mm position is a real plus compared to the competition and range of this lens is much appreciated. Used on a Canon 7D results are generally very correct up to 200 mm. Vignetting is better corrected to 85 mm on my Canon 15-85. A 300 mm there is loss of sharpness and chromatic aberrations appear. Nothing dramatic; closing at f / 8 it improves. DxO Optics Pro does wonders, especially for chromatic aberrations. Small regret, the rotation of the zoom ring a little too firm, is inverted with respect to Canon optics. Finally, it replaces my Canon 15-85 that is not better, with equivalent focal lengths.
You have to compare like with like as I do not understand the comments of "luctheo", unless you have received a bad copy? This zoom absolutely not worth 1 star. Tests on Ephotozine, lensbuyersguide, lenstip hunter and images are good to very good.
