Camera lens and filter adapter assembly

A magnetic mount for mounting external camera add-on devices to a camera lens assembly, said magnetic mount comprising:

• an adapter magnetic ring having an outer perimeter, an inner perimeter, a device mount surface and a camera mount surface, said camera mount surface of said adapter magnetic ring being coupled to said camera lens assembly, said adapter magnetic ring being magnetically polarized such that a magnetic field emanates away from said adapter magnetic ring in a plane perpendicular to said device mount surface;
• and
• a plurality of add-on devices each having a front mounting magnetic ring and a rear mounting magnetic ring, said front and rear magnetic mounting rings having an outer diameter and an inner diameter, said outer perimeter of said adapter magnetic ring being equal to said outer diameter of said mounting magnetic rings, said inner perimeter of said adapter magnetic ring being equal to said inner diameter of said mounting magnetic rings, said front mounting magnetic ring being magnetically polarized in an opposite direction than said adapter magnetic ring and said rear magnetic ring being magnetically polarized in the same direction as said adapter magnetic ring such that said add-on devices are magnetically coupled to said camera lens assembly when said add-on devices are placed in proximity to said camera lens assembly;
• said camera lens assembly comprising:
• standard connection means for coupling said camera lens assembly to a camera body;
• a plurality of lens elements;
• a helical mount having an outer shell, an inner shell, and an optical path defined through said plurality of lens elements by a hole bounded by said inner shell of said helical mount;
• helical mount connection means for mounting said helical mount to said camera lens assembly;
• a manual focusing ring;
• and
• non-rotational focusing means for focusing said camera lens assembly such that rotation of said manual focusing ring moves said helical mount in a forward and aft direction with respect to said camera body such that said helical mount and said plurality of add-on devices will not rotate.