Metabones Sony A-Mount Lens to E-Mount Camera ULTRA Speed Booster, Matte Black Metabones Sony A-Mount Lens to E-Mount Camera ULTRA Speed Booster - Front Cap - Rear Cap - Detachable Tripod Foot - Metabones 1 Year Limited Warranty Lens Mount: Sony A-Mount Magnification: 0.71x Crop Factor: With APS-C format camera: 1.07x Maximum Aperture: f/0.90 (with f/1.2 lens attached)