One thing that would be invaluable simulating is a variable aperture lens rather than this constant f/2.8 simulation. My girlfriend just got her first DSLR and was struggling with changing the aperture. While she understood the concepts, she wasn't familiar with working with a DSLR alone and since I wasn't physically present, it took me a while to realise over the phone she'd been changing the aperture by changing th…
What? To set aperture on a D5100 switch to A and use the command dial. (Shooting in Manual mode is simply torturing yourself unnecessarily if you don't know exactly what you're doing. In Aperture priority — or Program shift — setting aperture is simple and intuitive.)
My D7000 is more straightforward since it has a separate dial for this and no need to half depress the shutter release. (I assume you can also change the settings using the LCD, but that's of no use if you're looking through the viewfinder and trying to set manual exposure.)