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Hello Wetpixel! Initially I posted my question on this thread but it would probably deserve a dedicated discussion. My setup: Two Inon Z240 Type IV strobes, setup to be triggered via fiber optic cables (cables attached, working on previous Nauticam DSLR housing). Shooting fully in Manual mode, strobe outputs controlled manually via the strob knobs (not using TTL). Nikon D500 camera, in Nauticam housing. Because D500 doesn't have internal flash, Nauticam's new external flash triggering system is used, and connected to the D500 via a hot shoe. See here under section "External Flash Triggering" - i am NOT using the optional TTL circuitry, just the baseline one, which works in manual mode only. The problem: Inons don't fire My investigations so far: I am pretty sure the Inons are setup properly (i've switched from TTL shooting to Manual a while ago), and in fact i have been switching the fiber optics from the D500 housing to the D300s housing which i still have, and with the D300s Nauticam housing both strobes fire properly. So clearly the communication between NA-D500 housing and the Inons is not right. I made sure the NA-D500 emits a light signal: i unplugged the fiber optics and looked through the 2 "windows" and, surprise, they both emit a (strong) red light. So i confirmed the housing produces some light. Now i checked on the other end of the fiber optic cables (strobe side), and i do see the red light properly coming through the optical cable, so for me the fiber optic cables are fine - anyways they work perfectly with NA-D300s housing (triggered by the D300s' internal flash. My theories/open question so far: is it normal that the Nauticam LED flash triggering system emits red light? As far as i know LEDs consume fewer power when emitting white/blueish light. are Inon Z240 type 4 strobes supposed to work with a red light when using fiber optics as a trigger? I would be surprised that this very popular strobe model isn't compatible with the new Nauticam LED flash triggering system, but i just don't know. Can anybody help me figure out why it is not working, and how to fix this? I believe the NA-D5 housing uses the exact same strobe triggering system, so maybe some D5 shooters could advice? Some would say RTFM, but in fact the NA-D500 manual is still being written, that's one of the funny aspects of being a very early adopter cheers Nicolas