I bought this lens after seeing positive great reviews on it, I confirm that it is super good quality, the picture is sharp and bright. But ... there have to see over time if this is the right lens for my camera (Pentax K5 IIs) as lens weighs 100kg (not loins ^^) and if my neck / wrist supports it !!! It is important to have a good lens that can uitiliser every day and not just for 1 time / year @ _ @