An alternative to this fifty dollars is only Zeiss 55 / 1.8, but for 64,000 from the officials or 48,000-50,000 gray ones without a guarantee! The picture is super, no worse than Zeiss, it can only tighten up the contrast in lightroom. Autofocus is neat and tenacious, but the one who is noisy .: With sound, you need to shoot either externally or with a buttonhole, this is Zeise, who has silent autofocus! As a result, everything is the same as Zeiss, only many times cheaper, you can buy an excellent radio system with a recorder for the difference!