The color values of Opteka Digital Grey Card set have been tested under varying light conditions and show a high degree of spectral neutrality. Using the industry-standard X-Rite spectrophotometer, LAB values of L* 63.8, a* -1.6, b* -0.4 are measured from the surface of the grey card under D50 standard illuminant. For optimum color correction, the black card achieves truly deep blacks (RGB 16,16,15). The grey card displays superior spectral neutrality with measured values of 162, 162, 160. The white card has a tested RGB value of (220, 224, 223). All three cards have excellent uniformity across a range of light sources.

User Ratings and Reviews

5 Stars Valuable tool for any photographer
This white balance card kit is a must have for most photographers. Even if you shoot it RAW which allows you to edit the white balance ‘after the fact’ using these cards will allow you to set the white balance correctly while you shoot and cut down on editing time later. Small enough to slip into even a small camera bag and connected to a lanyard so they’re easy to carry, if you’re anything like me you’ll find yourself using them all the time. Especially useful if you’re doing a series of photographs in a controlled environment and you want to make absolutely sure you get your skin tones correct.

For the price these are a no-brainer.

5 Stars Simple, Efective must have
Not much to it. Not a lot of money for a simple device to speed up your photo processing work.

5 Stars Great Product! Fast Shippping!!!
It was shipped quickly! I have no problems, I would recommend this seller and this product.

1 Star Not a exposture setting grey card
It is a white balance grey card, and it is not for setting exposure. So guys beware of that.

5 Stars Perfect
This is SO EASY to use! I get some of the best photos when I use these cards before taking photos. Inside or out… I now try to always use these to get the white balance perfect.

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