I was amazed at the size of this "chunk of glass". However, as with all SONY products the `build quality` was faultless. I bought this for my H5 and it works perfectly and I can`t fault the image quality. Fitting this lens does unbalance the basic camera making it nose heavy, which is to be expected really.
If you iintend to interpose any filter between this lens and camera then be aware that vignetting may occur. I would suggest you get a ND (neutral density or skylight filter) and fit it to the front of the lens to protect, what is a very large (and easily damaged, as optical is inherantly `soft`), lens element. Not perfect but still a quality product all in all which should give years of good service. - Recomended.