If I were to buy just one (very) good Canon FL lens in the range between 20 and 50 mm (not a zoom lens) which one should it be?
Mostly to be used in street photography or landscape.
Just for "fun" to have one old, good Canon lens - but also to use on my AE-1 (without aperture control, I know but don't mind).
And maybe to put on an old F1 (as a working set) if I can find this camera in good working order for not too much money.
I like to go out occasionally and wander around with an old camera and shoot what comes on my path (or not).
Just one manual camera with one manual lens and a few rolls of Tri-X .... and enjoying a nice camera and a good day ;-)

BTW: I don't want to spend too much money, but I'm told the old FL lenses are not much wanted thus much cheaper.
But the glass can still be very good (for me and my old manual mania).