10721938_ony_HDW_F900R_HDCAM_Camcorders__Benefits_
[Features:] Optical Filter Wheels [Benefits:] 
For the optical picture treatment, two independent filter wheels (each with four filter positions) are provided, one with for Neutral Density (ND) and one with Color Correction (CC) filters are installed.
Sony HDW-F900R HDCAM Camcorders
Benefits: