Sigma’s EM-140 DG ring flash builds in some of the features we’ve become used to with modern speedlights, like TTL and high-speed sync. Here’s my take on it.
When you have to get in close, regular flashes usually aren't much good. That's when you need a specialized macros flash.
The Bolt VM-210 is a macro light with two light sources on flexible arms. It might look like some kind of bug with two antennas hanging out over the lens, but it’s a very versatile approach to macro lighting.