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Anonymous
old school flashes are sometimes just full power and dont have any buttons or mode. need to adjust aperture or use flashmatic mode, but thats rare nowadays.
later flashes have A modes, you set the aperture and a sensor on the flash calculates how much flash power is needed. more advanced flashes use TTL (through-the-lens) metering and are more reliable. TTL split up in a variety of more advanced protocols like D-TTL. for Nikon, the latest SB400/600/800 flashes are backwards compatible with any body, but modern bodies are usually not compatible with older TTL flashes
what body & flash do you have?
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