Canon 28mm f/3.5 II

Canon 28mm f/3.5 II

Among Canon's screw-mount wide-angles, the 28mm f/3.5 stands out for its very small size and the reputation it earned among rangefinder users as the sharper of Canon's two 28mm LTM lenses. It is a compact six-element optic in four groups, built for the Leica Thread Mount (M39) and coupled to the rangefinder, which made it a natural companion to Canon's own rangefinder bodies as well as Leica screw-mount cameras [1].

The lens is physically tiny, roughly 24 mm long and 48 mm in diameter, and light at about 120 g, which suits it to discreet street and reportage work. It takes 40 mm filters, focuses to about 1 m, and uses a conventional click-stopped aperture and a small focusing collar; users have noted that the focus ring on Canon's compact LTM 28mm lenses is small and takes some acclimation, a trade-off for the diminutive barrel [1]. Being a rangefinder-coupled screw-mount lens, it mounts on Leica thread bodies directly and on M-mount cameras with an adapter, and it has been used on modern digital rangefinders as well [1].

Collector discussion distinguishes a chrome (Serenar-marked) version from a later black-finished version, with users generally regarding the 28mm f/3.5 as sharper than the contemporaneous Canon 28mm f/2.8, though harder to find. A rare Contax-mount ("Canon CT") chrome variant is also reported by experienced users [1]. Comprehensive primary documentation for this exact model is limited in readily accessible English sources, so finish and version identification is best confirmed against the lens in hand.

Optical qualities

Rendering As a coated wide-angle from the late screw-mount era, the lens shows the vintage signature typical of its generation rather than modern high-contrast crispness. Long-time users describe it as a capable, detailed performer that resolves fine subject detail well, particularly when stopped down [1].

Sharpness Repeated collector consensus holds that the 28mm f/3.5 is sharper than Canon's 28mm f/2.8 LTM, and it is regarded as an excellent if hard-to-find optic [1].

Contrast and color In keeping with its era and coatings, contrast is moderate by modern standards, a quality some photographers find advantageous on digital sensors [1].

Distortion and vignetting Light fall-off toward the corners wide open is characteristic of compact screw-mount wide-angles of this period; Canon's small 28mm lenses are noted for visible vignetting at maximum aperture that diminishes on stopping down [1].

Digital use The lens has been adapted to digital rangefinder bodies, where its lower contrast and vintage rendering are sometimes valued for character [1].

History

Development and Launch The 28mm f/3.5 belongs to Canon's family of compact screw-mount wide-angles produced during the heyday of the Leica-thread rangefinder system, when Canon offered a broad line of lenses for its own and Leica-compatible cameras. It was positioned as the slower but optically refined sibling to the faster 28mm f/2.8, trading one stop of speed for a smaller, sharper package [1].

Production Evolution The lens is documented in more than one finish, with an early chrome version carrying the Serenar name and a later black-finished version; the Serenar branding ties the earlier examples to Canon's pre-modern lens nomenclature [1].

Special editions A Contax rangefinder-mount chrome variant, referred to by users as "Canon CT," is reported as very rare; beyond finish and mount differences, no widely documented factory special editions are established in accessible sources [1].

Collector Notes When buying, verify the optics by checking for internal haze or cleaning marks, a common concern with lenses of this age, and confirm whether the example is the chrome Serenar or the later black version. Because the 28mm f/3.5 is easily confused with Canon's more common 28mm f/2.8, check the engraved maximum aperture before purchase. The standard small Canon accessories (clamp-on or screw-in 40 mm filters, caps, and a suitable wide-angle hood) are worth confirming as present and correct [1].

Sources

• [1] 35mmc (Atanas Grozdev and reader comments, including David Hill's LTM 28mm notes). Canon 28mm f/2.8 LTM - A Short Review. https://www.35mmc.com/14/11/2019/canon-28mm-f2-8-ltm-short-review/