Canon SPEEDLITE EL-1 Advanced User's Manual page 64

Caution
Position the flash head toward the front and 90° up. When the flash head is rotated
to the left or right, the catchlight is not very effective.
To effectively obtain the catchlight in a person's eyes, shoot within approx. 1.5 m /
4.9 ft. from the subject (at ISO 100 with f/2.8).
Do not pull up the wide panel with excessive force. Doing so may detach the wide
panel from the Speedlite.
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