Steve Spencer wrote:
A lens that is one stop faster, but using a sensor (or a portion of the sensor if you crop) that has about one stop less dynamic range and color depth. To equalize the images you really should shoot the APS-C (or the shot cropped to APS-C) at one stop lower ISO and then the images will look very much the same and you will be using the same shutter speed.
In theory, you may be right, and if there's a window or other very bright light source in the background, that's also true in practice. Otherwise, indoors (which is what the OP was talking about), you shouldn't notice any differences at all. See the comparison images in post p.3 #20. Since my test was only concerned with general rendering, I unfortunately left the camera on Auto ISO, so it's not entirely suitable for comparison with the parameters you mentioned. Be that as it may. It was a thought, and the OP is free to develop it further or not.
