This standard specifies the minimum test target elements and their criteria to be used in determining the uniformity of illumination on the copyboard of a 35 mm planetary camera. The layout of the test target and the procedure to be followed in obtaining a uniform density of microfilm images from a planetary camera are established to assist in the achievement of high quality first-generation silver-gelatin microfilm of engineering drawings.
This standard deals exclusively with top-light and does not address the use of back-light. Sufficient need exists for a test target and procedure for top-light filming to justify publication without waiting for the development of a test target and procedure for back-light filming.
The test target and procedure developed are designed to complement that of the camera manufacturer.