Canon 135mm f/3.5 III

Canon 135mm f/3.5 III

Introduced in January 1961, the Canon 135mm f/3.5 III is the final factory-designated version of the company’s f/3.5 LTM telephoto. It combines a satin-black barrel with rangefinder coupling and a four-element, three-group optical design.

Optical qualities

Rendering

Canon retained the four-element, three-group construction used by the earlier versions. The lens provides strong central definition and restrained vignetting for its period, with contrast and fine detail improving after stopping down. Sample condition, especially haze and coating wear, remains an important variable.

Handling

The lens focuses to 1.5 m and accepts 48 mm filters. It measures 54 mm in diameter by 97 mm in length and weighs 424 g, making it slightly lighter than the preceding Type II. The large focusing ring is easy to grip, although the front assembly rotates during focusing.

History

Development and Launch

Canon marketed the Type III in January 1961 as the last named stage of its 135mm f/3.5 screw-mount rangefinder lens.

Production Evolution

The optical element and group counts remained unchanged. Development centered on barrel materials, structural details and lower weight rather than a documented change to the optical formula.

Special Editions/Variants

Specialist references distinguish minor production and engraving variations within Type III. These do not require separate optical profiles here.

Collector Notes

The satin-black body and late Canon engraving separate this version from the chrome Serenar Type I. Accurate rangefinder coupling, smooth rotation and clear internal glass are the main practical checks.