The Ezybalance is a great tool for getting the correct white balance and exposure for your shots. I use a Canon digital SLR, which I use on manual. I always set my white balance manually to get consistent results (rather then leaving it to the auto white balance which can vary from shot to shot) but sometimes none of the in camera settings are correct for the particular light you are dealing with. A quick shot of the white side of the Ezybalance and setting it to Custom in the camera - perfect colour balance! If the subject you are shooting is to dark, light, backlit, etc the camera can be fooled and give an incorrect exposure. A check of the gray side of the Ezybalance and you get the correct exposure, much easier than a light meter (mine has now become redundant). This is a handy size which collapses down and can fit in an SLR camera bag. Good product, recommended.