Rollei BAY III Blue Light Filter

Rollei Light Blue filter is a color conversion glass filter. The filter is a light balancing filter used to maximize the color temperature for a cooler tone. It absorbs the excessive yellow-red light from artificial light and renders red darker. The filter also maintains natural flesh tones while preventing reddish cast. It has a Bay III filter size and increases temperature from 3,000 to 3,200 Kelvin (1/3 stop).