Canon FD 50mm f/1.8

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The Canon FD 50mm f/1.8 is the default "normal" lens on Canon FD systems. It has six glass elements in four groups. The example illustrated on the left side has the original FD mount, with a 'breech-lock' (i.e a twist-ring to fasten the lens on), the example on the right side has the 'New FD' mount without ring. Four versions of the lens with breech-lock mount are listed at the Canon Camera Museum,[1] and one in the bayonet New FD fitting.[2]

More of them were sold than any other Canon FD lens (mostly with a camera).