Vivitar VIV-DF-3000, Руководство пользователя

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Important Notes for Flash Photography and Maintenance (cont.)
6. Bounce should only be used on lighter color ceilings or white walls with the zoom head
set at the 35mm position. Note that when using this feature, 2-3 f/stops of light will be lost
due to reflection.
7. Always use a fresh set of 4 batteries of the same brand and type when old batteries
are depleted and need to be replaced. Mixing and matching batteries of different types
and brands will greatly deteriorate the flash’s performance.
8. When the flash is not being used for extended periods of time (>2 weeks), remove the
batteries to prevent battery leakage. After the batteries are removed, do not expose the
flash unit and batteries to excessive heat such as fire or excessive sun light.
9. Charge up and test fire the flash unit at least once per month to maintain the optimal
performance of the flash tube and charging capacitor.