FD Mount

FD55mm f/1.2 AL

FD55mm f/1.2 AL
Marketed March 1971
Original Price145,000 yen (w/case and hood)
Lens Construction (group) 6
Lens Construction (element) 8
No. of Diaphragm Blades 8
Minimum Aperture16
Closest Focusing Distance (m) 0.6
Maximum Magnification (x) 0.11
Filter Diameter (mm) 58
Maximum Diameter x Length (mm) 75.8 x 55
Weight (g) 605

The world first interchangeable lens for 35mm SLR employing an aspherical lens element to achieve sharp definition even from the maximum aperture, was developed together with the highest-end system camera, the F-1 and the best selling SLR camera at the time, the FTb. The ground and polished glass aspherical surface is applied at the front surface of the second lens element. This aspherical lens makes central and peripheral light converge on a single focusing point to correct aberrations. Thus high contrast definition is obtained even at the maximum aperture of f/1.2. The abbreviation "AL" stands for the "Aspherical Lens".