It's big and heavy. Okay, with all the negatives out of the way, you can look forward to using this lens. The point of a lens is to pick up and focus as much light as possible, and generally lenses of this power have apertures of 5-6. But this is an f2.8. It's work in low light conditions is awesome. Image stablisation works really well and really is needed if hand held. But most photographers will be using this with a monopod or tripod, so thr stabilisation is not needed. I loved using this lens. Images are crisp and clean, and the fixed focal length ensures there is no colour aberation to distort images. Highly recommended. Note this is NOT a zoom lens.