Sony 50mm f/1.8 SAM DT Lens for Sony Alpha Digital SLR Cameras - Fixed Lens not zoomable Filter diameter (mm): 49 mm Small size, light weight portrait lens 35mm focal length equivelant on APS-C; 75mm Smooth and silent AF operation with built-in motor (SAM) Closest focus distance: 1.1ft (0.34m); Maximum magnification: 0.2x. The angle of view is 32 degree Please note: DT lenses are not recommended for use with the DSLR-A900 Mount : Sony A-mount