Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great neutralizer

Excellent for it's intended purpose of neutralizing light color casts. As there is no camera that will read whether light is distributed evenly over any given scene the proposed use of setting the exposure through the Disc is a mute point. In shooting hundreds of room scenes of furniture, people etc there are serious shifts in light balance across any given area. Most photographers know it, but many have forgotten - or never knew it. The light meter is still king of room lighting setup because it will tell you where extra, or less light is needed. Any device relying on the camera sensor, will be limited by it.