Vivitar 7mm F3.5 Fisheye Lens, Instruction Manual

Page: 7 / 16

-6-
Brightness Control
You can set the amount of brightness you want by turning the aperture adjustment ring when
using your lens.
When you turn the aperture adjustment ring between 22, 16, 11, 8 and 5.6 you are making
1 stop each turn. There are 1.5 stops between 5.6 and 3.5. Brightness can be set more
precisely by making half stops as well (see below).
5.6 and 8 are 1 stop apart (1EV). Set a 0.5 stop (0.5EV) between 5.6 and 8
A .