Closeup of flat objects
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Flat opjects need no depth of field -
lighting is most important
A flat bed scanner or a camera can be used to copy flat objects. (If using a scanner place a piece of clear artists acetate on the scanner bed before introducing the objects. This will protect the scanner surface from getting scratched. Although scanners have very limited depth of field, scratches will appear almost perfectly focused once created.)

Lighting on most flat object is best done from two sides at about a 45° angle. Look at the stamps below. If you are trying to get surface detail then one light at this angle will likely give better results. It will cause small shows that increase detail.

In either case avoid straight on lights as you will often get reflected glare. Notice that slabs require little depth of field.