Schneider 4.5" Round 1/4 Wave Retarder Filter (Unmounted)

The unmounted Schneider 4.5" Round 1/4 Wave Retarder Filter is a 2.5mm-thick polarization control filter that is designed for 3D cinematography. The process of recording 3D video employs a reflected image from the silvered surface of a 3D rig's beamsplitter. In instances where the recorded image contains glare, partial polarization can occur as the light entering the 3D rig is reflected from the silvered surface. This can result in disparity between the left and right optical paths created in part by the beamsplitter, and ultimately, a compromised 3D effect.