IB/E Optics PLx2VV 2x PL Extender
The PLx2VV Optical Extender doubles the focal length of your lens. Compatible with lenses covering VistaVision-class imagers, as well as S35 or smaller image circles. Optimized for a maximum input of T1.9 (but you can stop down on a faster lens if it's looking weird). Beware: you're spreading your transmitted light over 4x the area now, so brightness is decreased 2 stops.

Optical Elements
7
Maximum Image Circle
46.4mm
Maximum T Stop input
1.9
Light Loss
2 Stops
Input/Output Mount
PL