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<blockquote data-quote="WayneF" data-source="post: 270113" data-attributes="member: 12496">Not specifically about those flashes, but generally AUTO mode dates back to the 1970s (transistor automation, but no camera TTL yet).&nbsp; The flash has a front sensor which monitors its light reflected back from the subject, and it terminates the flash when that light is deemed sufficient exposure. It knows exposure because you set the used value of f/stop and ISO speed into the flash&nbsp; (ISO and ASA are same thing, same numbers, ISO is modern equivalent).&nbsp; Auto is automation, but not TTL, not controlled by the camera.You probably want Manual flash mode (which allows your control), and you set the power level for your exposure, full power, 1/2 power, 1/4 power, etc&nbsp; (whatever YOU deem to be correct exposure - could use a hand held meter).&nbsp; &nbsp; Fstop and ASA are ignored then, does not matter - it instead does the power level you set.&nbsp;&nbsp; DIN was a different European method of numerical film speed, like ASA, but different numbers.Here is a manual which may help (pdf link at bottom)<a href="http://mattsclassiccameras.com/vivitar_2800.html" target="_blank">http://mattsclassiccameras.com/vivitar_2800.html</a></blockquote>

[QUOTE="WayneF, post: 270113, member: 12496"] Not specifically about those flashes, but generally AUTO mode dates back to the 1970s (transistor automation, but no camera TTL yet). The flash has a front sensor which monitors its light reflected back from the subject, and it terminates the flash when that light is deemed sufficient exposure. It knows exposure because you set the used value of f/stop and ISO speed into the flash (ISO and ASA are same thing, same numbers, ISO is modern equivalent). Auto is automation, but not TTL, not controlled by the camera. You probably want Manual flash mode (which allows your control), and you set the power level for your exposure, full power, 1/2 power, 1/4 power, etc (whatever YOU deem to be correct exposure - could use a hand held meter). Fstop and ASA are ignored then, does not matter - it instead does the power level you set. DIN was a different European method of numerical film speed, like ASA, but different numbers. Here is a manual which may help (pdf link at bottom) [url]http://mattsclassiccameras.com/vivitar_2800.html[/url] [/QUOTE]

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