Sigma offers solid performance in all areas and is the “best 50mm F2 with autofocus available but at the same price as the Samyang 50mm f1.4 AF II,” according to Sony Alpha Blog which provides an in-depth review of the Sigma 50mm F2 for both stills and video capabilities.
It's fast, accurate and silent making it perfect for both stills and video work. While it produces the best results from F4 to F8, it still produces very good results wide open at F2 or narrow at F11, but performance drops off at F18.
Sigma 50mm F2 DG DN Contemporary Specs
- 9 blade aperture
- Weight: 350 grams
- Length: 68mm
- Filter thread: 58mm
- Minimum focus distance: 45cm
- Price: US$639, €699 with lens hood
Source: Sony Alpha Blog