Average Reviews:
(More customer reviews)These color cards are only a thin veneer of color on a white core. Don't even think of keeping loose in a pocket. My cards are already transfering colors between cards from slight rubbing together. The gray card has also picked up a brown tint (making it useless for white balance) by simply sitting next to my leather wallet--and try as I might, I cannot clean this tint--it is pemanently stained it seems.
White card has black splothes that won't come off, black card has white showingvthru from wear, gray card stained. Pretty sad--especially since I kept these iny pocket just once.
Click Here to see more reviews about: Opteka Premium Reference Color & White Balance Grey Card Set With Quick-Release Neck Strap for Digital Photography
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.
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