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Harrison & Harrison Optical Engineers, Inc. Camera Repairs and Owner Manuals
They are designed specifically for close-ups of small objects (macro). They are carefully edited to work at short distances. Some reach a size enlargement of 1:1, which means that the object will be in the negative the same size as natural. They are relatively expensive, but are needed in natural sciences, can be substituted in some cases for accessories such as bellows, extension tubes or lenses, or even use the macro in combination with these accessories.