What is the difference in DCAM and UCAM in grading proof coinage?

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What is the difference in DCAM and UCAM in grading proof coinage?

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The answer to this question is simply just a matter of PCGS versus NGC. PCGS uses the designation DCAM for Deep Cameo surfaces. In other words: strong frosted devices (the raised parts of the coin design) against deeply mirrored, clear fields. NGC uses the term UCAM for the exact same designation, only they call it Ultra Cameo. Likewise, ANACS uses the UDCAM (Ultra-Deep cameo), etc. It all implies the same depth of mirror and contrast. The CAM designation only would suggest a partial effect. Usually this is seen more in earlier proof coinage.