Data sheet: Canon FL 28 mm f/3.5

Pekka Buttler, 07/2024

Specifications

The table below summarizes the lens’ key specifications:

Brand:	Canon	Lens name	FL 28mm 1:3.5
Focal length(s)1	28 mm	Angle-of-view2	75°
Maximum Aperture	f/3.5	In Production	1966–1971
Lens mount	Canon FL	Subfamily (if applicable)	n/a
Length3	42,9 mm	Diameter4	65,9 mm
Filter ring diameter	58 mm	Weight	271 grams
Lens element count	7	Lens group count	7
Aperture blades (S/R/C)5	6 S	Focus throw	130 °
Minimum focusing distance	40 cms	Maximum magnification	1:11,0
Has manual aperture ring	YES	Has Manual focus ring	YES
Aperture mechanism type	Automatic/Manual	Aperture click stops 6	3.5–4–5.6–8–11–16

Further notes:
• This 28 mm f/3.5 lens was a relatively late addition to the Canon FL system. Also, this was Canon’s first ever 28 mm SLR lens. As such, it is the ancestor of a proud lineage of Canon 28 mm lenses.
• Together with the FL 19 mm f/3.5 R, they were Canon’s only lenses that offered a wider angle-of-view than the FL 35 mm f/2.5 [data sheet].
• Being a later-series Canon FL lens, it has the typical aperture ring at the front of the lens and a ring to select between Auto aperture and manual aperture modes located between the focus ring and the breech-lock tightening ring.
• The W-60 and W-60B lens hoods (clamp-on type) can be used with the 28 mm f/3.5 lens.

The history of Canon FL lenses

Canon is undoubtedly one of the great names in 35 mm SLR photography. Ever since the 1959 introduction of the Canonflex – Canon’s first interchangeable lens SLR – Canon has constantly focused on being at the forefront of Camera innovation. Often this has necessitated taking stock and redesigning both cameras, lenses and lens mounts. Unlike its archival Nikon, Canon has not tried to integrate all novel features in the same lens mount, but has instead repeatedly launched new, modified mounts to facilitate new features, while still often (but not always) managing to maintain a decent degree of backwards compatibility.

In short (a longer version is here), the development of Canon SLR mounts can be traced as follows:
• 1959–1963: R-mount ⁷. Canon’s first SLR lens mount. Breech lock-type mount with aperture automation (camera is able to stop down lens for taking the shot.
• 1964–1969: FL-mount. Breech-lock type mount, physically similar mount as Canon R-mount, but camera-to-lens communication linkages somewhat different. Cannot communicate selected aperture to body (stop-down-metering only).
• 1970–1978: FD-mount. Breech-lock mount. FD lenses compatible with FL-cameras and vice versa. Manual focus lenses that communicate aperture information to camera, hence opening the door for automatic exposure (both shutter priority and aperture priority possible)
• 1979–1986: new FD-mount (a.k.a. FDn). Bayonet mount, backwards compatible with FL and FD mounts. Otherwise, as FD mount.
• 1987–today: EF-mount. Electronically controlled autofocus lenses that use an internal focusing motor. Compatible with previous mount lenses only using an adapter with optics.

While many see the Canon FL mount lenses as risky oddities compared to the subsequent FD and FDn lenses, Canon’s lineup of FL lenses is not to be frowned at as, in many ways, the FL lenses laid the groundwork for the subsequent success of the FD system. Granted, the coating technology is decidedly dated, and the need for stop-down metering is decidedly a hassle on Canon FD bodies, but especially when adapting lenses on mirrorless cameras, Canon FL lenses offer an interesting value proposition.

Versions

To the best of JAPB’s knowledge, Canon only made one version of the 28 mm f/3.5 lens for the FL mount. Also, Canon’s subsequent 28 mm f/3.5 lenses used a somewhat different design (see more below):

Lens	Produced	Optical design	Filter thread	Weight	Related
FL 28 mm f/3.5	1966–1971	7 elements, 7 groups	58 mm	240 grams
FD 28 mm f/3.5 (chrome nose)	1971–1973	6 elements, 6 groups	55 mm	290 grams	[data sheet]
FD 28 mm f/3.5 S.C.	1973–19758	6 elements, 6 groups	55 mm	250 grams

Adapting

NOTE! Unless noted otherwise, the following applies to all Canon FL lenses:

This lens cannot be used natively on any current SLR or dSLRs. To use it in its native environment, you will need a Canon FL or FD-mount film body.

Thanks to being a fully manual lens (manual aperture, manual focus), the lens can be adapted to all mirrorless cameras using a suitable adapter. However, to be able to stop down the lens, you will need to take one of two routes:

1) Acquire a Canon FD adapter and use its ability to engage the FD/FL lens’ aperture control lever, to make sure that the diaphragm’s opening always reflects the aperture ring’s selection.

2) Acquire a Canon FL adapter (or modify a Canon FD adapter by removing its aperture control lever) and instead set the lens’ aperture mode ring into manual before taking a shot.

Moreover, a large range of special adapters (helicoid adapters, tilt/shift adapters, speed boosters) for using Canon FD (And, hence, Canon FL) lenses on most mirrorless systems are available.

Using Canon FL lenses on dSLRs is a possibility, but is not problem free. Thanks to the relatively short flange focal distance of the Canon FL/FD mount (at 42,0 mm, clearly shorter than that of any full-frame dSLR mount), any adapter will necessitate some optics to achieve infinity focus. Again, a Canon FD adapter should work…

P.S. This lens does not have ‘the bulge’ (see more), which makes adapting it relatively straightforward.

Footnotes

1. Focal length is (unless stated otherwise) given in absolute terms, and not in Full-frame equivalent. For an understanding of whether the lens is wide/tele, see ‘Angle-of-view’. ↩︎
2. Picture angle is given in degrees and concerns the diagonal picture angle. Rule of thumb:
   > 90 ° ==> Ultra-wide-angle
   70–90 ° ==> Wide-angle
   50–70 ° ==> Moderate wide-angle
   40–50 ° ==> ‘Standard’ or ‘normal’ lens
   20–40 ° ==> Short tele lens
   10-20 ° ==> Tele lens
   5-10 ° ==> Long tele lens
   < 5 ° ==> Ultra-tele lens ↩︎
3. Length is given from the mount flange to the front of lens at infinity. ↩︎
4. Diameter excludes protrusions such as rabbit ears or stop-down levers. ↩︎
5. S=straight; R=rounded; C=(almost)circular at all apertures. ↩︎
6. Numbers equal aperture values on aperture ring; • intermediate click; – no intermediate click. ↩︎
7. The Canon-R mount should possibly be renamed to (or referred to) as the Canomatic and Canonflex mount to avoid confusion with the modern mirrorless mount that is sometimes also referred to as the Canon R mount. ↩︎
8. Canon introduced the Canon FD 28 mm f/2.8 S.C in 1975, and as it was introduced at a largely equivalent price point as the FD 28 mm f/3.5 S.C had occupied in 1973, the conclusion that the introduction of the f/2.8 version implied the end of the f/3.5 version is defensible. ↩︎