Product Information Sony's Sonnar T FE 55mm f/1.8 ZA lens has a quite fast f/1.8 for broad creative control meaning that the contrast and resolution brings out the best in full frame image sensors such as those in the α7 series. This amazing Sony lens has a 9-blade circular aperture that works with this lens state of the art optics to create beautifully smooth bokeh. (The effect of a soft out-of-focus background). Shoot with confidence as the lens is dust and moisture resistant meaning that the lens continue to perform exceptionally well in moderately wet or dusty conditions. Features E-Mount Lens/Full-Frame Format Aperture Range: f/1.8 to f/22 Three Aspherical Elements Zeiss T* Anti-Reflective Coating Linear Autofocus Motor; Internal Focus Read More