So, with real cameras, you can use the "Tv" setting (that's what it is on Canon cameras at least) to specify a minimum shutter speed (like 1/60 or 1/100) to shoot at, and the camera automatically adjusts other settings. This can give you shots that are a bit too dark (if you don't use a flash), but saves you from getting motion blur due to slow shutter speeds. Are there any iOS apps that let you set a minimum "shutter speed"? I get a fair amount of blurry photos, most often without a flash being used, due to the iPhone camera preferring to shoot at a slow shutter speed like 1/20 in order to make it nice and bright. This is true of the default camera app, ProCamera, Camera+, and everything else I've occasionally tried.