
Tamron’s latest patent is for a 135mm f/2.8 lens for APS-C based cameras (202.5mm equivalent). Canon filed patents for several different lenses: 70-300mm f/4.5-5.6 100-400mm f/4.5-5.6 85mm f/1.2 85mm f/1.8 135mm f/2 50mm f/1.4 Olympus filed a patent for a 40-200mm f/4 Micro Four Thirds lens.