That depend on so many things. The target the lighting the surroundings. Best to experiment w the settings or even different camera apps. Just tossing out my .02s
Took this picture of my friends Telecaster with his pedalboard while we were tearing down our sound equipment one night. Needless to say, he likes to play and he's got the gear to back it up
HDR Camera+ has been oustanding for taking pictures, takes all the pictures with the different contrast and settings and does all the HDR stuff for you, really takes some great pictures. Will post a few when I can get them uploaded sometime.