Canon FL 85-300mm lens
Encyclopedia
The Canon FL 85 - 300mm lens is part of the FL series of lenses produced by Canon between 1964 and 1971. The 85 - 300 is a zoom lens
Zoom lens
A zoom lens is a mechanical assembly of lens elements for which the focal length can be varied, as opposed to a fixed focal length lens...

 with a maximum aperture of 5 and minimum aperture of 22.

The FL range of lenses was replaced by the FD range of lenses but had the same mounting system so could be used on FD mount cameras. FL and FD lenses were replaced by the current EF range and cannot be mounted on any Canon EF
Canon EF
Canon EF can refer to a specific product or a product line:*Canon EF camera *Canon EF lens mount...

 cameras. For this reason the FL range became redundant and second hand lenses became very affordable.

With the introduction of Canon's 5D Mark II digital SLR
Digital single-lens reflex camera
Most digital single-lens reflex cameras are digital cameras that use a mechanical mirror system and pentaprism to direct light from the lens to an optical viewfinder on the back of the camera....

 the FL 85 - 300 has made a comeback. The 5D Mark II is the first Canon digital SLR to record high definition video
High-definition video
High-definition video or HD video refers to any video system of higher resolution than standard-definition video, and most commonly involves display resolutions of 1,280×720 pixels or 1,920×1,080 pixels...

 and the FL 85 - 300 has quickly become highly sought after because of its high quality optics and ability to be used on the modern EF body through a simple adaptor. 5D film makers are also buying up FD and FL lenses for their ability to have the aperture open and closed manually. The FL 85 - 300 has become the most desirable lens in the FL range for modern day 5D filmmakers because at 300mm f.5 it offers superb depth of field
Depth of field
In optics, particularly as it relates to film and photography, depth of field is the distance between the nearest and farthest objects in a scene that appear acceptably sharp in an image...

 with manual aperture control.

The 85 - 300 is also popular with users of Bolex 16mm film
16 mm film
16 mm film refers to a popular, economical gauge of film used for motion pictures and non-theatrical film making. 16 mm refers to the width of the film...

camera but must be mounted with an adaptor.
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