The original Magic filter is designed for DSLR and advanced compact users. This filter requires more input from the user as it works with the adjustable manual white balance of the camera. This filter is designed to give high image quality while working over a wide depth range and without causing too much loss of light. Magic Filters are designed to fit on all the common wide angle lenses used underwater by DSLR photographers - there are 5 sizes for DSLRs. For COMPACT CAMERAS this CM is a one size fits all 50x50mm square filter. This can easily be cut to fit your lens with a pair of scissors and comes with a stencil for cutting. The Magic not only makes underwater easy, it also solves the technical shortcomings of getting colour with flash. Flashguns cannot light up large subjects, but with a filter you can get colour over massive areas. Strobe light also falls off rapidly with distance, but with the filter you can taken shots where colour penetrates deep into the images away from the lens. The original Magic Filter was designed to work with your cameras white balance, when set manually, to produces great results over as wide a depth range as possible. It will produce vibrantly coloured images from the surface down to 15m (50ft), and then subtler, more muted tones there after, which are still an improvement on reality. That said the filter is designed to work best for available light shooting, in clear blue water, on bright sunny days between 3 and 13m. Magic Filters aren't for every dive, but they do enable underwater photographers to take types of images that they never could before.