Canon FD Resources
FD Ultra-wideangle Zoom lenses: FD 24-35mm F/3.5 L


Canon Ultra-wideangle Zoom FDn 24-35mm f/3.5 L Lens

Originally, first introduced back in 1978 as a Canon FD 24-35mm f/3.5
S. S. C. ASPH and upgraded a year later as Canon FD 24-35mm f/3.5L in 1979 with a revised FD lens coupling at its rear. Optically, bith lenses are the same except for the updated version is lighter. This appealing lens, the first wide-angle zoom in the world to offer an aspherical element, covers an angle of view from 84° to 63 °. The aspherical surface of its first element minimizes barrel distortion at short focal lengths and effectively controls curvature of field (an error which affects image quality by fall-off of sharpness towards the edges), coma, astigmatism, and lateral chromatic aberration. The optical performance of this lens virtually exceeds the performance of a fixed focal length lens.

FDn 24-35mm L.jpg (17k) Loading..
Close focusing to a distance of 0.4m is possible. This lens features Canon's two-group design, the front half and rear half of the lens having separate functions. There is no shift of focus hence the lens maintains optimal performance.

Note: This Zoom Lens was eventually replaced by another Canon classic in 1983 - a true extra-wide Canon zoom of FDn 20-35mm f/3.5 L which rocked the photographic market during the early/mid eighties.

NOTE:- Info on the NEWER autofocus version

The Basic Wide-Angle Zoom Range The 24-35mm zoom covers the range of the three basic wide-angle lenses, 24mm, 28mm and 35mm. Although its zoom ratio of 1.46 may appear small, the actual visual difference is substantial. There are times when the need to switch lenses interferes with the process of composition and shooting. With the 24-35mm zoom you can move back and forth between focal length extremes, changing the field of view in one smooth, uninterrupted action in the search for the right framing. As a matter of fact, many of the techniques using wide-angle zooms involve exploring the possibilities of a scene or situation without having to change location.

Thinking in Terms of Wide Angle Zoom The danger in using a 24-35mm zoom lens is thinking only in terms of subject area coverage. There is absolutely no doubt that the lens gives you the flexibility to shoot large groups of people or broad landscapes. But it's also a lens that can portray a more subjective point of view. Moving in close with the 24-35mm zoom lens is the key to shoot ing images which reveal great depth. To emphasize perspective you need strong foreground detail, and you can focus as close as 40cm (15.7 in.) from the subject. Use the zoom range to determine the composition that will provide the best effect. The 24-35mm zoom is an ideal landscape lens as we've already mentioned. However, it does require care in focusing since the smaller image rendition makes focusing a bit tricky. But with modern viewfinders and screens that yield a brighter image, the problem is not as severe as it would have been years ago. For wide-angle lenses, the focusing aids in your viewfinder will help provide accurate focusing. A recommended method with any zoom lens is to focus at the longest focal length (in this case, 35mm) and then compose as desired. Focus on the most important area in the scene. With any wide-angle lens, depth of field is fairly deep at a given focusing distance and the aperture selected, thus is more forgiving of minor focusing errors. The
Canon AF EF lens group has also has a similar version - except it has also being replaced with newer lens design with even wider angle.

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Focal length: 24-35mm
Aperture ratio: 1:3.5
Construction: 12 elements in 9 groups (including one aspherical lens)
Coating: S.S.C. (super spectra coating)
Angle of view: Diagonal 84°- 63°; Vertical 63° - 38°; Horizontal 74° - 54°

FDn 24-35mm L.jpg (17k) Loading..
Distance scale: 0.4m (24mm at 0 4m, 0 08 magnification) (35mm at 0.4m, 0.11 magnification) to 3m OO (ft) 15 - 10.oo
Focusing mechanism: Rotation of front lens group
Zooming: Rotation of zooming ring
Minimum aperture: R22.A
Diaphragm: Automatic
Filter size
: 72mm
Hood: BW-72
Length x max. diameter: 55.5mm x 65mm
Weight: 470g

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