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<p>[QUOTE="Conder101, post: 3148140, member: 66"]That's because scanners are designed for imaging 2 dimensional things and the focus is set to the surface of the glass and the depth of field is small. A raw coin sitting directly on the glass is pretty much in the depth of field. A coin in an airtight is raised above the surface of the glass and a slab has it even further away so you get poor images. Believe it or not cheap scanners do a better job than high end scanners because the cheap scanners focus and depth of field isn't as tight, so coins are more likely to be within the focal range.[/QUOTE]</p><p><br /></p>
[QUOTE="Conder101, post: 3148140, member: 66"]That's because scanners are designed for imaging 2 dimensional things and the focus is set to the surface of the glass and the depth of field is small. A raw coin sitting directly on the glass is pretty much in the depth of field. A coin in an airtight is raised above the surface of the glass and a slab has it even further away so you get poor images. Believe it or not cheap scanners do a better job than high end scanners because the cheap scanners focus and depth of field isn't as tight, so coins are more likely to be within the focal range.[/QUOTE]
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