The DCR-731 wide-angle lens is a popular wide-conversion lens that achieves a compact size of 66mm in maximum diameter with a new lens design, while also boasting a high resolution of 375 lines (MTF30% value) at the center. Attaching the DCR-731 wide-angle lens to a camera lens allows for shooting with a wider angle of view, 37% wider, and focus is maintained throughout the entire zoom range. The brightness (F-number) of the camera lens does not change even when the DCR-732 or DCR-731 is attached. Three adapter rings for 37mm, 43mm, and 55mm diameters, a lens cap, and a lens case are included as accessories. Since the DCR-732 and DCR-731 lenses are identical, there is no difference in their performance. The DCR-731 conversion lens was designed for digital cameras, but it can also be used with 3-CCD video cameras and digital high-definition video cameras with a megapixel still image capture function at full zoom (with a 10x zoom lens). Actual Magnification: Diagonal 0.71x, Horizontal 0.75x Lens Construction: 2 groups, 2 elements, coated optical glass Distortion: -9.9% (at the widest angle) Front Filter Diameter: None Mounting Screw Diameter: 52mm Product Dimensions/Weight: φ66 x 29mm, 130g DCR-731 Accessories: 3 adapter rings, lens cap, lens case The reason for the difference between the actual diagonal magnification and horizontal magnification is that a distortion value of -9.9% occurs, causing the captured image to be barrel-distorted. Thank you for viewing.