01-31-2014, 02:21 PM
Sorry, Brightcolours, I don't understand this - can you clarify? I've heard that Sony E mount is similar (or even the same) mechanically as F mount, but there's a smattering of ultra-fast lenses usable on it (including the tailor-made Mitakon and SLRMagic 50mm f/0.95). Do they exhibit the kind of behaviour you've described? (I admit I have no first-hand knowledge on the matter, but people have been adapting old stuff to A7/A7r like crazy over at FredMiranda).