Update 2018: When working with the flash and wireless controller in close proximity you might experience misfires but there is an easy solution, the controller needs to be put into closeup mode. See the trouble shooting note from the Godox website below:
After a years working with a Nikon CLS SB-R200 wireless macro flash system, I decided it was time for a change and I went with the The Godox 2.4GHz radio wireless system.
Here is a quick list comparing the features and issues that are most important to me in choosing a new studio macro flash system.
-Nikon CLS system suffers from mis-fires.
-Zero mis-fires with the Godox so far.
-Nikon CLS is an infrared based wireless system, not a radio system.
-Godox is a radio wireless system (more reliable).
-Nikon CLS has an over sensitive thermal protection shut down loop, shoot 25 images in a row at 1/128th power, and CLS will shut down to protect it from overheating, even at 1/128th power!
-No over-sensitive system shut down with the Godox TT350s, and X1 transmitters.
-The Nikon system is closed to other camera brands, no surprise there.
-Godox TT350 speedlites automatically detect the signal and settings provided from either the Sony or Nikon Godox transmitters. So I can use Nikon Godox flash with my Sony body.
-The SB-R200 flash use a propriety mounting foot for some reason.
-Godox flash use a normal ISO standard flash mount.
-The SB-R200 flash uses CR123A batteries that are very hard to find in the field.
-Godox TT350 flash use AAs.
Flexible Auto Switching
The Godox 2.4GHz system has Auto Sensing radio slave modes for Canon, Nikon, Sony, M4/3, etc. This means you can use Canon, Nikon, Sony, and M4/3, version transmitter units (or master speedlites) with the same set of flashes and they will automatically switch to the corresponding slave mode as required., and this includes full manual or TTL functionality.
The Godox 2.4GHz system is not directly compatible with Canon or Nikon’s radio systems, but the Godox wireless transmitters will control other Godox wireless flash. The means that I can set up my Sony A6300, and then switch to my Nikon D850 without changing the flash units, I just need to change the body and the transmitter.
Perfect so far.
The Godox system offers 6 different flashes, http://www.godox.com/EN/Products_Camera_Flash.html, the smallest is the TT350.
I went with the TT350s, because they are smallest Godox flash, just a little larger than a Nikon SB-R200 wireless flash. The head on the TT350 swivels and tilts where the SB-R200 does not. Also the TT350s are about $85 on Amazon, thats about 1/2 the cost of the Nikon SB-R200.
Godox makes a few different wireless transmitters but I went with the smallest model, the X1T-S. This unit pretty much works like any other wireless controller, once its setup, using it is easy. Cost is about $45 on Amazon, this is a lot cheaper than Nikon or Canon infrared wireless controllers
The TT350 strobes automatically detect the signal and settings provided from the Sony or Nikon Godox transmitter, so I can use a Canon, Nikon, or Sony body with the same flash setup and the same speedlites, this is exactly what I was looking for!
The Godox Diffuser
I stumbled on a Godox diffuser on Amazon gave it a try. It won't fit the TT350s directly since it is made for a larger flash, but it works well for macro photography, but not attached to the flash, but placed over the subject.
Godox Wide Angle Diffuser
12 cm (4.72 in) in diameter
Price on Amazon: $12.99, free shipping
After removing the mounting plate, I used a hole saw to drill a larger, 2.25 inch opening at first, and later I picked up two new diffusers and opened these up more, to 2.5 and 3 inch openings. To prevent scratching delicate surfaces like silicon wafers, I added a small strip of felt-like flocking material to each diffuser.
Links for more info: