Amazon.com : Vivitar 6-Piece Multi-Coated Rotating Graduated Color Filter Set (72mm) Includes: Red, Yellow, Blue, Orange, Grey & Purple : Camera Lens Filter Sets : Electronics
Nisi introduces the 'Switch,' a filter system with independently rotating holders: Digital Photography Review
Blue Rainbow Streak Lens Filter Special Effects Anamorphic Optical Glass 77mm/82mm Flare Camera Filter W/rotating Ring For Dslr - Camera Filters - AliExpress
Schematic of the rotating filter test cell (not to scale) | Download Scientific Diagram
Dynamic Filtration with Rotating Disks, and Rotating or Vibrating Membranes - ScienceDirect
NiSi Cinema 4 x 5.65" True Color Rotating PL Linear NIC4565TCRPL
Ceramic Rotary Filter / rotating ceramic filter, nanoparticle filter for concentration, rinsing and solvent replacement