I agree with jjj and leon, but won't the lower noise feature of the two new models mean higher iso is now viable? by higher I mean within 1600?
I'm guessing there are noise comparisons of the newer low noise cameras at iso 800 or 1600 with the older ones, and 1600 iso at 5 minutes may still be acceptable.
I'd suggest comparing noise at 1600 iso between the two for 60sec or higher exposures and then deciding.
a few members here have the 60da and might be able to post some test results.
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