Summary: I initially bought this zoom because of all the other feedback that I had found on this site, nevertheless I must say that this is the worst zoom I have ever used in terms of brightness and sharpness. I used it to shoot photos for a friend’s wedding and I was really angry afterwards because the sharpness in all the pictures was really bad, even when I shot at high speed, small ISO and working at f11 or f13.
Summary: I just returned the lens. I did not like it at all. It is VERY slow and not sharp. More work in photoshop. I upgraded to the Nikon 2.8 and LOVE IT! From now on I will wait and save my money and only buy Nikon lenses for my Nikon. What a difference!
Summary: I bought this lens because I didn't want to spend the $1,100 for the Canon L lens. I used it for mainly portraits, HS Seniors, Weddings, etc. This lens is nowhere near sharp. If you are looking just to sell 8x10s and smaller, this lens will work great for you. However, if you plan on selling 11x14s, 16x20s, 20x24s, etc., don't plan on using this lens. I tried it on my Mark II n, 30D, 5D. All the images looked soft.
Excerpt: Покупали через инет-маг Алло. Попался объектив с фронт-фокусом. Хотели сами отнести в сервисный-центр, обзвонили кучу сервисных центров, везде делают ремонт только за деньги. Вернули в Алло, через месяц пребывания (якобы) в серв.центре объектива, ждем возврата денег.
Pros: не успела заметить
Cons: не нашла гарантийного сервисного центра на Украине.