altura PRO SERIES User Manual page 10

4: TTL mode cont.
The only area you would need to adjust is the
flash intensity/exposure. Do this by using the
<ARROW> buttons. A smaller fraction (1/128)
means a lower intensity, while a larger fraction
(1/1) signifies a stronger intensity.
5. M Mode
Manual (M) mode requires you to manually input
some of the flash settings yourself. The ISO and
Aperture are still automated according to your
camera's settings.