M35mm f2.0lens optics contains 7 elements in 5 groups. Optical Design is based on Sonnarformula. Lens has aluminum body and durable brass multi-thread mechanics. Themost classic 35mm focal length is very close to human view perspective. Itworks great for capturing main object and related environment background. Withadvantage of compact size, this focal length may frequently be used by mostphotography enthusiasts. It is also great lens to keep hanging on cameras fordocumentary photography.