Lens Mount: Sony E-mount Format: 35mm full frame Focal Length: 90mm Equivalent Focal Length (APS-C): 135mm Lens Elements: 11/15 Angle of View (35mm): 27° Angle of View (APS-C): 17° Maximum Aperture: f/2.8 (The lens has a defect due to being dropped, and the camera does not read the aperture number. It needs maintenance.)