That's a really interesting test. Is there any reason to shoot with a lens attached? Why not with just the body cap on? Also, in ACR, did you zero the brightness and contrast sliders or did you leave them at the default 50/20?
I left the lens caps on so as not to bother swapping lenses on other people's cameras and risk adding dust to their sensors (another gripe for another time ).
Yes, thanks for confirming; ACR brightness and contrast were left at default 50/20 or 50/25, whichever it is, i can't remember and I'm not in my studio to check for another 8 hours.