Film plane mark.

Many cameras indicate the film plane by a mark printed on the top of the camera body - it’s a small circle bisected by a long line. (the mark rather resembles part of the Plimsoll line found on ships)

People doing precise macro photography sometimes need to know the exact distance from the film plane to the subject, so this mark can be useful for that.

cf. film plane, focal plane, macro.

Entry last updated 2002-04-06. Term 470 of 1487.

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