Due to a number of upcoming trips where I'm likely to be shooting a lot of macro at night (Borneo and Madagascar), I'm looking to upgrade my macro rig from a dual-head system to a three-speedlight system.
Dual-mini-head systems are great for portability, for the occasional macro shot, but don't seem to quite cut it in terms of power or flexibility for macro-heavy trips - they can struggle when shooting at f/16 or f/22 (really f/32 or f/44 at 1:1 magnification) unless you pump up the ISO, and don't cope well with softboxes. So, I'm looking to build a rig that will hold three speedlights - one key light (with softbox), one fill light and a third light to use either as a rim light or to illuminate the background (to alleviate the black background problem commonly seen in macro). Preferably full-sized flashes (e.g. Godox V1), but possibly the smaller ones (e.g. V350), which are more portable, but still much more powerful than typical dual flash systems.
The problem is finding a way to hold all three flash units at the same time - particularly the flash that will be used to light the background or as a rim light. This will have to extend out behind the subject, illuminating it from behind, so will need to be on the end on a long arm. Putting it on a separate light stand or tripod isn't an option, nor is having a second person hold it - it needs to be a single rig attached to the camera, that can be held (if awkwardly) in two hands.
Does anyone have experience with the long, flexible flash arms like
this one from Novoflex, or
this one from Manfrotto? Well-built, solid arms from reputable companies, not cheap eBay Gorillapod-type arms. Will they hold a full-size Speedlight extended to full length? Or will I have to use a smaller flash unit (e.g. V350, Canon 430EXIII, etc.)? Or are they totally inadequate for the task and I'd have to resort to solid arms with lockable joints (e.g. the Wimberley macro arm)? Putting larger flashes on solid arms close to the camera, then putting a small one on a long, flexible arm won't work - the flash illuminating the background usually needs to be much more powerful than the ones illuminating the subject. Does anyone have any other macro flash rig that will hold multiple full-size flashes?