Can be attached easily in one turning action utilizing the bayonet system; can be attached and detached underwater. (The lens can be used on land as well as underwater.) When the wide-angle conversion lens is mounted, the angle of view increases from 24mm to about 16mm. [ Lens ] 3 elements in 3 groups [ Underwater angle of view ] 85 ° (106.5 ° on land) [ Magnification ] 0.65x [ Depth rating ] 60m / 200ft [ Weight: Approx ] 406g / 14.2oz (underwater: Approx. 230g / 8.1oz) [ Dimensions ] (DIAxD) 97x48.5mm / 3.9x1.9 inch * The lens can be used on land, but slight vignetting (dimming) may occur in the four corners of the image. Slightly zoom in to telephoto to eliminate vignetting. *A shadow may appear in the image if the built-in flash is used when the wide-angle conversion lens is mounted. It is highly recommended that you use an external strobe.