This months Practical Photography has a feature on macro lenses. Their "best in test" went to the Canon 100mm f2.8L IS USM. Best independent was Sigma 105 f2.8 EX DG OS HSM (other combinations of abbreviations are available)
I think they are exposure flashes. I only have one SB910. Setting to "---" the picture is almost black (indoor). Switch back to "TTL" and all good again.
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