Widen the perspective of your wide-angle lens even further with the Sony VCL-ECF2 Fisheye Converter . This conversion lens is for the Sony SEL16F28 16mm f/2.8 and SEL20F28 20mm f/2.8 E-mount lenses. The 16mm f/2.8 Alpha E-mount lens has a 35mm equivalent length of 24mm which becomes 15mm when used with the VCL-ECF2, and the 20mm f/2.8 lens goes from a 35mm equivalent of 30mm to 20mm. It is constructed of 4 elements in 4 groups. Front and rear lens caps and a carrying case are included to help protect the lens.