"Graham" <graham@[EMAIL PROTECTED]
> wrote in message
news:opKdnRXC7fFbVIDVnZ2dnUVZ8vKdnZ2d@[EMAIL PROTECTED]
>I am trying to buy a lens for my old Canon A1 and not sure if I can just
>buy any Canon FD lens. Could someone confirm, will any Canon FD lens fit
my
>Canon A1? I was about to buy a Canon 50mm f1.4 FD lens from ebay, but the
>seller seems to think it could be a different fitting.
>
> Graham
>
The Canon FD mount lenses will fit the Canon A-1 (born April 1978). The
earlier FL mount lenses will also fit, but you will not have certain
automatic functions.
The FD lenses have two pins on the back: the one at the bottom (6 o'clock
position) stops down the lens for shooting. The one at 9 o'clock position
tells the camera what f/stop has been selected for metering purposes. The
older FL mount lenses do not have this pin. The Canon FX camera did not do
through the lens metering, so it didn't care what f/stop was selected. The
later FTql metered through the lens, but you had to manually stop down
using
a lever beside the lens to get a meter reading.
The FD lenses will fit and work just fine on the older cameras that were
designed for FL lenses. The second pin is simply ignored.
The original FL lenses and the early FD lenses were breech-lock-bayonet
lenses. The mounting is a three tab bayonet, with a separate ring
(breech-lock) that rotated to engage the tabs. Users complained that three
hands were required to change a lens, one to hold the camera, one to hold
the lens, and one to turn the ring. Since many users didn't have three
hands, Canon made the breechlock a stationary part of the lens-- you
rotated
the entire lens to mount it. These lenses are also compatible with both
older FL and newer FD mount cameras.
The short answer is "the seller is wrong, buy the lens."
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