5.8-8.4 Full Frame lenses

Design of the 400-800mm lens A newly patented Sigma patent discloses the design of three Full Frame zoom lenses. One design is for the newly launched 300-600mm f/4. 0 lens. The other two designs are for the: 400-800mm f/8 (total length of the lens is 447mm) 180-800mm f/5. sonyalpharumors.com »