The Rosco Cinegel range includes over 75 tools for controlling light. Since it's introduction in 1970, Cinegel has continually developed and grown to meet the working needs of the professional. In 1974, Cinegel won an Academy Award for technical achievement. Cinegel #3402: Rosco N.3 Mired Shift N/A Reduces incident light by one stop. Extra-wide 57 in. Optically clear. (Transmission = 50%).