0.72x Focal Reducer Speed Booster Adapter for Contax Yashica C/Y mount lens to Sony E mount APS-C - A6600 NEX-7

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0.72x optical glass lens adapter for using Sony NEX (E) mount APS-C digital cameras with Contax Yashica C/Y mount lenses. Reduces focal length to 0.72, adjust the image size to nea r 1:1, so that the focal length of the image is close to actual focal length of the lens, e.g. 50mm x 1.5 x 0.72 = 54mm. Helps to increase the maximum aperture to 1 stop, also can use it faster by 1 stop. Switching camera to "Release w/o lens" mode is essential.Allows focus infinity.Blue spot will occur if lens is shot to sunlight or lamp directly.With front and rear caps. Show more