VINTAGE CANON CAMERA LENS FD 28mm f:2.8 MADE IN JAPAN 1970'S 3RD VERSION GREEN A

Description

Photographs throughout Ad:
Offered for auction from a recent Estate sale  is the following a
VINTAGE 1970’s CANON LENS FD 28mm F:2.8 (GREEN A - on Rim meaning  THIRD VERSION as noted below)  MANUFACTURED BY CANON MADE IN JAPAN --
Below is additional information on this Vintage in very good almost from appearance Minimal if any usage and appears to show no ware as photo shows. The Canon FD 28mm F:2.8 camera lens is as received from estate sale.
This  Vintage camera Lens as noted above exhibits minimal if any surface ware, appears to be complete and functional.  The only exception to being 100 % complete is that 1 or the plastic lens covers has Nikon impressed on the front, the other lens cover has Canon which is the manufacturer of the Lens.  Both lens caps have a padded sticker attached to the front which I assume was to protect the lens when in transit in a box or camera case.  Lens appear to be in good condition when looking out the view port from both directions.  I haven’t cleaned the lenses they are as found.   The markings on the Canon Camera Lens is as follows “CANON LENS MADE IN JAPAN - CANON LENS FD 28mm f:2.8.  A Green A is present on the rim of the camera lens.  A number 1067354 is also present on the rim.  On the very back of the lens the following is printed A315.  Below I have added additional photos and information on the Canon FD 28mm F:2.8 Lens.  Please view photos for condition. Lens is sold as is.
The Canon FD lens mount is a physical standard for connecting a photographic lens to a 35mm single-lens reflex camera body. The standard was developed by Canon of Japan and was introduced in March 1971 with the Canon F-1 camera. It served as the Canon SLR interchangeable lens mounting system until the 1987 introduction of the Canon EOS series cameras, which use the newer EF lens mount. The FD mount lingered through the release of the 1990 Canon T60, the last camera introduced in the FD system, and the end of the Canon New F-1 product cycle in 1992.
The FD mount was based upon and replaced Canon's earlier FL mount (which in turn had replaced the R mount); FD-mount cameras can use FL lenses in stop-down metering mode. Though never officially explained by Canon, others have attempted to assign a meaning to the "FD" designation. One such attempt states that the "FD" notation stands for "Focal-plane shutter with Dual linkage for diaphragm control"; in actuality, there were two linkages and two signals: the automatic aperture lever, aperture signal lever, full aperture signal pin, and automatic exposure lock pin. This is twice the previous lens series, which used the "FL" designation, said to mean "Focal-plane shutter, Linked mount."
Over the 21-plus years of production, Canon introduced 134 different FD lenses ranging from 7.5mm through 1,200mm in seventeen different fixed focal lengths and nineteen different zoom ranges, one of the most, if not the most, extensive manual focus lens lines ever produced.
The Canon FD system enjoyed huge popularity in the 1970s and 1980s, when it established and grew a market share with professional photographers as well as having equipped over a million consumer users. Indeed, sales of the Canon AE-1 camera alone exceeded one million.
Canon obsoleted the FD mount by its decision to create the all-electronic EF mount. Thus, the FD mount system, with limited provision for auto-focus, is now commercially obsolete, and Canon FD cameras and lenses are available for low prices on the second-hand market. This makes the system very attractive to 35mm film photographers who demand the highest optical quality, while not needing auto focus capability.   FD lenses can be used on many mirrorless interchangeable-lens cameras with a suitable adapter. They are a popular alternative to modern lenses among some users, though they lack autofocus.
The FD lens mount is a breech-lock mount, which is a variation of the common triple-flanged bayonet attachment. The advantage of the breech-lock over the bayonet is that neither the contact surfaces between the body and lens, nor the signaling mechanisms, rotate against each other when the lens is mounted. This prevents any mechanical wear, which could conceivably reduce the very precise lens-to-film distance or introduce communication errors between lens and body.
Canon's first iteration of the FD breech-lock, extended forward from the earlier R- and FL-series lenses, used a rotating mounting ring at the rear of the lens; the lens body itself did not rotate for mounting. Its minor disadvantage was a somewhat slower lens change than a bayonet.
There are three different versions of breech ring FD lenses:
The first version had a chrome plated front barrel (nicknamed "chrome nose") and a green "o" for auto exposure.
The second version had a black front barrel and still had a green "o" for auto exposure.
The third version had a black front barrel, and a green "A" for auto exposure which is the FD Canon offered for Auction. These different versions are detailed below under variants.
Second-generation FD lenses, first marketed in 1981 as New FD, are mounted like bayonet-mount lenses in that the photographer twists the entire lens body to mount and dismount, though the actual mating surfaces still remain fixed.  This retained the advantages of the breech-lock mount while enabling the convenience of a bayonet. The letters SC or SSC, to indicate the lens coating, were no longer put on the lenses. Canon documents stated that All new FD lenses except for the new FD 50mm F1.8 had SSC coatings. Canon later chose a bayonet-style mount for its EOS system's EF lenses, where there is no precision mechanical coupling.
Like its FL predecessor, the FD mount system allowed automatic diaphragm function, but in addition, a new signal pin supported full-aperture metering. A second signal pin for the "auto" setting of the aperture dial, plus a linkage to allow the camera to set the degree of diaphragm opening, enabled integral auto-exposure. The first camera to use this was the 1971 Canon F-1, when equipped with the Servo EE Finder. Later, the Canon EF of 1973 had automatic exposure built-in, as did the very popular Canon A-series cameras (save the AT-1) beginning in 1976.
Thus, starting with the first FD lenses produced in late 1970, all FD lenses had the capability of supporting full-aperture metering and multiple Automatic Exposure (AE) modes using both shutter-preferred and aperture-preferred modes. Even Programmed AE was possible with no modifications to the lens mount, though at the time of its introduction Canon did not have an AE camera body in the FD line. This was a design triumph for Canon that no other camera or lens maker was able to equal in 1970. Every other camera manufacturer had to make one or more alterations to its lens mount to enable full aperture metering, and later AE and or Programmed AE operation.
The FD mount has no support for either electrical or mechanical lens-body communication required for autofocus, which was a primary reason for its retirement. (The three AC series lenses, extended from the FD lens mount, described below, are an exception). While Canon could have adapted its mount to support auto-focus, as did other manufacturers, the company instead chose to make a clean break with the past and design a completely new interface with support for electrical signaling and control.
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