Watch Mark Holtze's video to learn more about the SIMMODING process: VINTAGE LENSES FOR VIDEO


  • 85mm Outer Diameter (O.D.)
  • 82mm Front Inside Thread / Compatible with any 82mm diameter filter
  • Made of solid billet aluminum and anodized black


The Simmod Pro SimRing  screws onto the front filter thread of your lens and acts as a step up ring to provide a 82mm front internal thread for screw on accessories, while maintaining a consistent 85mm outer diameter for matte box compatibility.


Simply put, our 85mm Rings are designed for precision and optimum fit, smoothness, and compatibility with any matte box system on the market. Converting your front outer diameter to 85mm is a quick and inexpensive upgrade that adds purpose and convenience to any lens set up.


To select the size you need, you must determine the front filter diameter of your lens.  Please follow the resources below as a reference.




If you don't see the size you need, please contact us.


RESOURCES: (filter sizes, lens info)

Contax Zeiss Lenses

Leica R Lenses

Nikon Lenses

Canon FD Lenses

Mamiya Lenses

All Other Lenses


    • 85mm Outer Diameter
    • 82mm Inside Thread
    • Made of solid billet aluminum and anodized black