I think the GX series uses the Sigma protocol, but it has been noted that Sigma TTL flash units are big and heavy.
But what about the flash Sigma made for their own compact cameras?
Does this have the same TTL standard? It does have a TTL auto mode according to the manual:http://www.sigma-imaging-uk.com/pdfs/EF ... 0Flash.pdf
DIMENSIONS : 56.5mm (W) x 73.5mm (H) x 20.5mm (L).
Guide number of 14 (100 ISO) which is 2 times more powerful than the built-in flash on the GX200
It's pretty small and light, and can run on AAA batteries, just like the GX camera can in an emergency too.
Maybe this is a good solution? Any experiences?