Tiffen 77ND6 77mm Neutral Density 0.6 Filter

With and without Tiffen Neutral Density 0.6 filter Tiffen Neutral Density Filters 0.6 When it is desirable to maintain a particular lens opening for sharpness or depth-of-field purposes, or simply to obtain proper exposure when confronted with too much light intensity, use a neutral density (ND) filter. This will absorb light evenly throughout the visible spectrum, effectively altering exposure without requiring a change in lens opening and without introducing a colour shift. Neutral Density Explained Neutral density filters are denoted by (Optical) Density value. Density is defined as the log, to base 10, of the Opacitance. Opacitance (degree of absorption) of a filter is the reciprocal of (and inversely proportional to) its Transmittance. As an example, a filter with a compensation of one stop has a Transmittance of 50%, or 0.5 times the original light intensity. The reciprocal of the Transmittance, 0.5, is 2. The log, base 10, of 2 is approximately 0.3, which is the nominal density value. The benefit of using density values is that they can be added when combined. Thus two ND . 3 filters have a density value of 0.6. However, their combined transmittance would be found by multiplying 0.5 x 0.5 = 0.25, or 25% of the original light intensity. Who are Tiffen? Tiffen has been a leading manufacturer of photographic filters, lens accessories, software, and camera accessories for the consumer/professional imaging and the motion picture and broadcast television industries for 75 years. The company has a rich history of innovative product design, superior optical consistency, and unparalleled quality. Tiffen has been recognised for its product and engineering excellence, earning a Technical Achievement Award and a Scientific and Engineering Award from the Academy of Motion Picture Arts & Sciences, as well as multiple Emmy Awards. Product Features Eliminates overly bright, washed-out images Balances exposure Controls depth-of-field Allows slower shutter speeds to produce blurred motion effects 10 year manufacturer warranty