Flash recommendation for the S5II/S1R is requested. - I have read that Lumix and Olympus flash units share the same TTL compatibility. Is this true, and if so, what do you recommend for a small flash unit to use for casual indoor family photos, where TTL flash metering can be used? Also, does anyone have experience with the affordable Godox TT350O Mini Thinklite TTL Flash? Thanks in advance for all advice.