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| p.3 #5 · Lens size: sensor size, registration distance, aperture |
To me this kind of thinking makes no sense. "Fast" is about light and exposure, getting the shot when there isn't much light. An f/2 lens on MFT is still an f/2 lens.
On FF f/4 gives the same depth of field, but it isn't a "speed" thing, it is an equivalence thing. Anyway, let's not open this can of worms again.
An f3.5 lens would be considered "fast" on 6x7, but not on a 1" sensor. It's all relative to sensor size.
Outside of the DOF differences, a lens at f1.8 on a D7000 at ISO 100 would be equivalent to shooting f2.8 on the D800 at a little over ISO 200. Of course, if you're not comparing similar sensor tech, that comparison may slide a bit one way or another, but it's a decent guide, and I'd imagine that the FF NEX will have similar sensor tech to the aps-c NEX cameras.
The question to me is, outside of the issues some have with X-trans, would someone rather have the 23/1.4 lens for Fuji on an X camera, or the rumored 35/2.8 lens for the FF NEX?? You're gonna have a little more equivalent speed with the Fuji f1.4 lens, but the f2.8 FF NEX lens is quite a bit more compact. It may hinge on the price of the FF NEX and lenses. Hmmm....