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Thanks for answering my questions Ray. As always you provide some interesting insights and makes even happier with the F3.8 system.
By the way I think some DSLRs are probably up around 65% QE. CMOS sensors in digital cameras are getting all the research. Take a look at the about to hit the market Sony A7r - backside illuminated full frame 42.4 mp sensor with copper wiring rather than aluminium and 3.5X throughput as a result. So higher QE than A7r which is currently rated around 60% QE. I believe it as a 30 second ISO6400 image at F2.8 lights up everything.
Greg.
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