Abstract
The paper gives the user a simple relation with which he can decide the requirements for photographic pictures to achieve mask structures of desired size and edge resolving power. The low pass behaviour of the objectives can be obtained with sufficient accuracy by Kirchhoff's diffraction theory. The efficiency of the photo emulsion as amplitude discriminator can be described by the blacking characteristic. By these means a relation is derived and experimentally examined for the width of rectangular windows dependent on the edge resolving power. The theoretical limit for aberration free objectives of the aperture 1·0 and photo emulsions without contrast losses is about 0·2 μm. The practically achievable ‘safety distance’ is greater by about a factor 2 due to the emulsion losses and the geometric image defects.
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