Canon calls this lens the Canon FL 50mm f/1.8 I. It was introduced in March of 1964. A high quality standard lens of 4 component, 6 element construction that belongs to the so-called improved Gauss type. It incorporates a new type glass for the rear element and the various aberration compensations are excellent. It is also the smallest and lightest of the FL standard lenses because its aperture ratio is held at f/1.8.

This lens was followed by a second improved version. Externally they are identical but the optics have been optimized for improved performance. They can be distinguished by weight. The type I weighs in at 228 grams and the type II at 280 grams. This example weighed in at 227 grams. It is a type I.

Lens Type:             Prime

Focal Length:       50 mm

Max Aperature:   f /1.8

Min Aperature:     f /16

Lens Mount:         Canon FL

Construction:       6 elements in 4 groups

Filter Thread:       48 mm – does not rotate with focus

Accessories:

Construction:       This is a solid heavy lens with obvious metal construction

Serial No.:          309932

Condition:          Excellent – optics are clear, no marks