Abstract
1. Farfield radiation patterns of single ommatidia of the fly,Calliphora erythrocephala, have been photographed. Clear radiation patterns of the first and the second waveguide mode have been observed. 2. According to theory, the shape of the (optical) angular sensitivity of a photoreceptor equals the shape of its farfield radiation pattern, at least for a monomode fiber. 3. The farfield radiation patterns of single photoreceptors have been evaluated quantitatively by means of microdensitometry and have been compared with theoretical calculations according to a lens-waveguide model. Theory and experiment are in good accordance for different wavelengths, different lens apertures, and different photoreceptor diameters.
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