Macro Ring Flash for Ricoh GR?

[sunappu]

Hi GR-ers

I've just got my new Ricoh GR at the beginning of this month and having some questions:

Is there anyone having an experiment shooting macro using the macro ring flash?

If yes...

Which macro ring flash is suitable for ricoh GR?

Is it Pentax-AF160FC Macro Ring Flash perfect companion for GR + GH-3 on it?

Or the other flashes?

Or perhaps, we couldnt use the macro ring flash since the lens is too wide?

Please share your opinion...Thanks in advance