[Tanmoy Das Karmakar]

Hi. You’ve to enter the right iso to get your desired shutter speed. If the subject is Statics, no movement is there. Then shutter speed 1/50, or 1/10 or 1/2000 shutter speed get you same results with the constant exposure value +/- (must use tripod for very low shutter speed like 1/10 or 1/50) and if the subject is moving then you’ve to increase your shutter speed by increasing the iso. When you get the the desired shutter speed what you want then stop the increaseing iso. Yes, high iso creates more noise. Every cameras have their different iso performance. Crop body creates more noise compare to full frames.