Appendix 7—figure 5. Calibrating the rhabdomere displacements in microns and their receptive field movements in degrees.

(A) A whole image of a Drosophila’s left eye, the camera chip’s full 2048 × 2,048 pixel range. (B) a high-resolution graticule placed at the same focal plane as the image (A) gives the full image size of 303 × 303 µm. Thus one pixel ~ 0.1479 µm. (C) A schematic of the main optical components in a normal Drosophila ommatidium. Its optical properties indicate that a 1 µm rhabdomere displacement shifts its receptive field by 3.56°.