I have had this one for 10 years now
Sigma Imaging UK | EM-140 DG Macro Flash
This page may be of interest
More Macro Rigs | Up Close with Nature
Wow. The contraptions we come up with. Leaning toward the em-140. Yes they save a ton of money but I don't want to be fiddling with something when an opportunity is dwindling away. Read reviews and specs so I'll take a few days and let it soak in.I have had this one for 10 years now
Sigma Imaging UK | EM-140 DG Macro Flash
This page may be of interest
More Macro Rigs | Up Close with Nature
Just curious as why you would want a ring flash for ttl shooting? For doing macro you would want to keep it a bit more under your own control.
But if you must...
you can probably try this as an inexpensive tester... Error
There's quite a use for portrait photography with a ring flash, too... at least I would think so, seeing a lot of the video shots and photos that are out there these days. Would it be a similar ring flash that would create those amazing circular catch lights in the eyes?