Canon Serenar 35mm f/3.2

Canon Serenar 35mm f/3.2

The Canon Serenar 35mm f/3.2 is a compact Leica thread-mount wide-angle lens introduced in June 1951. It formed part of Canon's rapidly expanding postwar rangefinder system and occupied a brief position between the slower Serenar 35mm f/3.5 and the faster Serenar 35mm f/2.8 introduced later in the same year.[1][2]

Canon constructed the lens with six elements in four groups. The optical formula is a symmetrical Double Gauss type, offering a more sophisticated design than the four-element, three-group construction of Canon's earlier 35mm f/3.5 lens.[1][3] The diaphragm has six blades and closes from f/3.2 to f/22.

The lens uses the Leica thread mount, commonly called LTM, L39 or M39, and is coupled to the camera's rangefinder. Minimum focusing distance is one metre. Its 35mm field of view normally requires a separate accessory finder when used on early screw-mount cameras without built-in 35mm framelines.

The chrome metal barrel measures approximately 48mm in diameter and 22.8mm in length, with a recorded weight of 165g. The lens accepts 34mm screw-in filters and has an infinity lock on the focusing control.[1]

Naming and engraving variants

Canon officially catalogues the model as the Serenar 35mm f/3.2. Surviving lenses can carry either the earlier SERENAR engraving or the later CANON LENS wording on the identification ring.[1][4]

These engraving differences do not indicate separate optical generations. Both versions use the same focal length, aperture, barrel type and 34mm filter fitting, and should remain grouped under one model entry.

Optical qualities

Contemporary standardized test data is limited. Collector reports generally describe moderate contrast, good central resolution and rendering typical of an early coated rangefinder lens. Performance usually improves when stopped down, while flare and reduced contrast may become visible when strong light enters the lens.[5]

These impressions vary considerably with the condition of individual examples. Haze, cleaning marks, internal contamination and incorrect reassembly can have a greater effect on image quality than the original optical design.

Identification

The lens can be identified by:

• A chrome, compact Leica thread-mount barrel
• 35mm f:3.2 or f:3.2 35mm engraving
• Either SERENAR or CANON LENS branding
• Six elements in four groups
• Six aperture blades
• A 34mm filter thread
• A one-metre minimum focusing distance
• An infinity locking focus control
• Approximately 48mm diameter and 165g weight

It should not be confused with the Serenar 35mm f/3.5, which uses a four-element, three-group optical formula, or the Serenar 35mm f/2.8, which is a separate faster model.

Sources

1. Canon Camera Museum, Serenar 35mm f/3.2
2. FlynnGraphics, Canon S Series Lenses
3. Pentax Lens Research Group, Canon Serenar 35mm f/3.2 Patent Data
4. Antiquary, Canon and Serenar 35mm f/3.2 Engraving Variants
5. Rangefinder Forum, Serenar 35mm f/3.2