Get 3x closer and 43% wider field-of-view; Optical design corrects barrel distortion and improves edge-to-edge sharpness; 0.7x wide-angle conversion; Fully multi-coated optics for maximum light transmission; Fits all SeaLife Micro-series and ReefMaster RM-4K cameras; Easily attach/remove lens while underwater; Attaches to SeaLife "Lens Caddy" Lens Holder (Item SL091); Precision 4-element/4-group high-grade optics (internal optical glass); Polycarbonate dome lens with scratch resistant hard coating; Includes neoprene dome lens cover, rear lens cap and protective pouch