Hi all. This topic has become particularly relevant to me as a (soon-to-be) upgrader from a D810 to the D850, since I traditionally used the integrated flash on the D810 to trigger my SB-600 set. The D850 has no integrated flash and the SB-600 won't act as a CLS master (only a slave), so I need another solution. Nikon's documentation on the subject isn't entirely clear, and while I'm aware of third-party solutions, the documentation I've found on them isn't entirely English, clear or not. A lot of replies on this topic get prefaced with "I never use automated flash control so it doesn't matter", which hasn't helped me much in working out what level of support everything has. Let's assume that I'm an idiot or my subjects move, and I actually do at least want to know whether iTTL works. I shoot flash infrequently enough that I'd like a working solution and it doesn't have to be too exotic, but it could do with being a bit idiot-proof and ideally not "replace all my SB-600s" expensive. I do have a coily off-camera hotshoe, but it's unwieldy and only gets me to one flash. So. I'd like to know solutions exist, how they attach to the camera, what level of support they offer, and how well they work, with a side order of how expensive they are. Nikon's solutions appears to be: I continue using optical flash triggers and buy an SU-800, which is big and expensive and not, of itself, a flash, to trigger the SB-600s. I continue using optical flash triggers and buy a trigger-capable flash (SB-500, SB-700 or above) to put on the hotshoe, mostly ignore its capabilities as a flash, and use it to trigger everything else and exercise my wrist muscles because of the weight on the camera. I go the official radio trigger route and get an SB-5000, a WR-R10 and a WR-A10, That's expensive but relatively light, though it leaves a mildly precarious dongle on the front of the camera blocking where I'd otherwise put a long-exposure-capable trigger cable. I could then put the SB-5000 off-camera and also use it to trigger the SB600s through optical CLS. All these at least support iTTL and allow me to control (two) groups of power from the camera, which can be useful if I've arranged everything precariously. The first two are a lot more bulky than the D810's integrated flash, the third one is a lot more expensive. Ilkka does swear that the third option is reliable, however. I realise a wide selection of radio triggers are available if I want to configure the flash power manually on each flash. I don't - that's tedious and occasionally impractical. I believe some solutions now have some intelligence. I assume Nikon's is the only solution that allows you to change the flash weightings from the camera menus - that others have to be adjusted from the transmitter attached (somehow) to the camera? I'm curious whether other solutions can optical CLS trigger more flashes (and whether they're all in the same group, if so) - or am I stuck with the flashes to which the radio receivers are attached? Given that my flashes are already able to work with optical CLS, I don't really want to shell out for a set of redundant radio triggers unless I need to, even if they'd increase reliability if I suddenly decide to use lots of flashes outside in sunlight. (I don't - that's when I use reflectors and rely on the sensor dynamic range.) I'm prepared to believe that someone has a protocol that makes the flash work as though it were on the hotshoe. Which is a good start, but won't get my SB-600s talking to each other. If someone else's solution effectively duplicates the SB-5000/WR-R10/WR-A10 set for a lot less money, that would be interesting, although most of the camera-side triggers I've seen are bulky enough that I'd find them obtrusive. On the other hand, I could quite possibly stick third-party radio receivers on all three of my SB-600s for less than the cost of an SB-5000. Okay, we're veering into me speculating about answers to my questions. What's out there? What do people use? Aside from my passive-aggressive grumbling about Nikon removing functionality that I was using, am I going to find a solution that makes me happy? Otherwise it looks like I'm going to be budgeting an extra £700 for my D850 purchase to get off-camera flash working again. Thanks in advance.