One of the original L prime lenses made by Canon in FD, which has been remounted into EF for modern digital cameras. This lens has a special softness when shot wide open. I have compared it most to the Rokinon 24mm t1.5. It is a very hard to choose which is better when shot wide open. There is a certain dreaminess to shooting wide open that may be too compromising for the wide angle, but stopping down will significantly tone down the effect . If you are shooting medium to close up, the dreaminess may be kind of nice! !
This entire lens set is in EF with focus, iris and zoom gears and 77mm inner diameters and 80mm outer diameters.
They will cover Full Frame, Super 35mm and m4/3 sensors.