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A4 and A6 package contains two similar size gray cards. Each is protected by a rice paper so that the surface will not be easily blemished. The gray card will be degraded due to long term use especially against strong light. Users must take care in order to have a longer life for the card. Therefore, it is advised to take out one card and keep it in a folder for photographic work. We have tested the gray card in various lighting condition from strong sunlight to indoor lamp. The accuracy is enough for taking digital photo including metering and white balance setting. |