photogdave
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This is why I sold my Canon 5D and am switching to Nikon for digital.
It's one of the main reasons why I desperately wanted an M8.
In Canon's infinite wisdom and drive for total automation they crippled the distance and aperture scales on their lenses, so it is difficult or impossible to scale focus.
For street photography, documentary work and general shooting this is a disaster and probably the reason why you see so many photos these days with the subject centred in frame...
Nikon has followed a similar path, but at least they still give you the option to use older manual focus lenses on their newest digital bodies. With Nikon you get the best of both worlds.
I do not think that the RF concept is obsolete; it's just mostly forgotten.
HL
You should have hung on to your 5D! The Canon EF mount is far more accommodating to older manual lenses than Nikon. With adapters you can mount Nikon F, Leica R, Contax Yashica, and probably other old manual lenses, with the only linitation being stop-down metering.