I used manual Canon F1's years ago, there was a feeling at the time that the breechlock FD lenses were better made and more solid than the then recently introduced FD lenses without the outer breechlock ring, which seemed a bit "plasticky" by comparison at the time.
Also if you're interests are landscape and architecture, then there's little point in spending extra moeny on fast lenses. Put it towards a solid tripod instead.
I used manual Canon F1's years ago, there was a feeling at the time that the breechlock FD lenses were better made and more solid than the then recently introduced FD lenses without the outer breechlock ring, which seemed a bit "plasticky" by comparison at the time.
All Canon FD lenses are breech lock lenses and are fully functional with no modifications on any generation FD mount body. The only exception I can think of is that the AE Finder FN on the New F1 cannot display the selected aperture when an older breech ring lens is mounted. New FD lenses are not "bayonet" mount lenses. The separate breech ring was simply replaced, or integrated with, the lens barrel. Unlike traditional bayonet mount lenses, the mating surfaces of an FD lens and camera, as well as the aperture levers and signal pins, remain stationary while the lens is mounted.
The "plasticky" barrels on the New FD lenses are, in reality, a composite material that is 70% glass fibers by weight suspended in polycarbonate. In other words, it's essentially fiberglass. Its rates of thermal expansion and contraction are closer to that of optical glass than that of the metals it replaced, and can be machined to very tight tolerences. I understand that the term "plasticky" is usually used to describe tactile impressions and personal preferences. However, I feel the term can be misleading to the uninformed.
I thought you meant in the AE mode and the shutter speed on A.The dispaying of the shutter speed in the viewfinder of the New F1 is built into the camera's viewfinder and does not depend on the type of lens mounted. The AE Finder FN has a window that sits over the aperture ring of a New FD lens, allowing it to display the selected aperture in the AE Finder FN, but only if it's in the aperture priority AE mode (i.e., the shutter speed dial is set on the red "A"). By eliminating the separate breech ring, Canon was able to move the aperture ring closer to the lens mount and standardized its location on all New FD lenses for this purpose. The aperture rings on the older breech ring lenses are further away from the mount and cannot be read by the AE Finder FN.
All Canon manual focus lenses FL and FD, both old and new, are breech lock type. Canon did not make a normal bayonet type. The register surfaces do not move against each other when the lens is mounted as they do with a normal bayonet; that is the whole point of the breech lock. In the case of the later FD type the whole of the barrel rotates to lock rather than a chrome ring.
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