| If you can, don't change any other variables. For some reason people in this hobby like to change lots of things all at once which does no good at determining what change was for the better or worse. Keep a good log of dosing and a journal of visual effects. Setup a tripod (don't move it) and take a pic everday. Like CarmieJo said, don't use automode on the camera for this will produce different results every time. This will show the results better than anything. | 
