The EF as you write Theo is a little known model even amongst camera enthusiasts and they can still be bought for reasonable prices, when it was introduced in 1973 ( the A series didn't come out until 1976 ) it had the same build quality as original F1 but a much more sensitive shutter priority AE Silicon cell metering system than the F1's Selenium metering together with a hybrid vertical running electro/mechanical shutter that would work mechanically at most speeds even if the battery failed. My EF with the FD 35mm f2 is my go-to camera for street shooting and it's great.As for nomenclature, I think Canon made a mistake with the wonderful Canon EF. They had the F series and the A series and the EF just got lost; many people don't know it exists. I didn't know it existed until a few years ago (thanks, Ben!). It doesn't help that their EOS system lenses are called EF lenses.
A handy timeline reference for Minolta, Canon, Nikon Pentax:
http://minolta.eazypix.de/slrtable/
So now Nikon has Z cameras, Z lenses and Canon has EOS R cameras and RF lenses. We'll see what becomes of that, but I suspect it's the End.
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