Closeup filter.

More accurately, “closeup lenses,” though the former term is commonly used. These are add-on lenses - essentially magnifying glasses - which you can screw onto the end of your lens on the filter threads.

Such filters allow you to move much closer to a subject than you normally can, permitting macro photography at the cost of some image sharpness. Cheap closeup filters have only one glass element and thus are very vulnerable to chromatic aberration. Better closeup filters have two elements. Sold by Zeiss and Hasselblad under the name “Proxar.”

cf. chromatic aberration, element, extension tube, macro.

Entry last updated 2002-05-08. Term 224 of 1487.

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