Evaluative is the way to go imho. Half ping pong balls can make good diffusers, although I'd be careful of melting etc.
Flash lighting in macro is very hard to get right, and I quite admit that I suck @ lighting. I much prefer natural light. I'm looking forward to the Mark IV @ ISO 6400 and natural macro shots @ f8. I'll probably get a Canon 100mm macro lens to replace my Sigma 150mm, only because it's smaller and lighter and I can get away with slower shutter speeds to avoid camera shake issues.
Dave
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