Photographic, cinematographic, optical apparatus and instruments, namely, zoom, fisheye, wide-angle, telephoto and image-distorting and enhancing lenses and lens filters for use with cameras, mobile phone cameras, PDAs, and PC tablets; detachable screen covers for PDAs, mobile phones and PC tablets to enable easier viewing and privacy; non-medical monitoring apparatus, namely, weight sensors for use for use with mobile phones, PDAs, and PC tablets for measuring individuals' weight; apparatus ...