Does any company make Back-side illuminated sensors in Aps-C or FF Size? Wouldn't this tech allow a massive jump in ISO performance?
Isn't the Sony's "Exmor R" a back illuminated sensor?
Yes, but it isn't made in APS-C or FF size.
You're right. Then it might be Canon in their labs: http://www.canonrumors.com/2012/01/patent-large-back-illuminated-sensor/
Interesting, now we know what the next 5D4 and 1Dx2 sensors will use this tech.
Prepare for a usable 102,400 ISO. Which if your read that number out-loud, is a joke from a person coming from film.