Why is there a limit of 9 interconnected T-series flashes?
Having modified a number of 3rd party flashes for use with Oly gear, I am fairly familiar with the T-series circuits. The OM2N service manual has some of the best published data on the interface. Here is my best guess: The short answer is the LED flash ready circuit probably constrains the number of flashes, as it uses different current levels for the “flash connected” but **not ready** vs “flash ready” state. When you attach many more than approx 9 flashes the flash ready current level is reached from the sum of the flash connected signals before the flashes are ready. With more than 9 flashes the LED ready current total exceeds 20 milliamps (mA) (2.3mA*9) **when used on an OM2 or OM2N**. Often small LEDs like these are only rated to handle 20mA continuously, so this might shorten their life. In practise this is probably not a problem because the relatively small total number of flash ready usage hrs. On some versions of OM2S’s and newer models the LED current comes from the camera ba
