The BH-726 lens hood included with the opera 50mm F1.4 FF has a special filter window incorporated into the design. When the BH-726c window is removed from the hood the user has access to the filter allowing them to rotate polarizer or other rotation type filter.

Compatibility

Tokina Lens Hood for Opera 50mm f/1.4 Lens

Designed specifically for Tokina Opera 50mm F/1.4 FF