I'm pretty new to the whole medium format thing. I've got a wedding job to do next month. I'd like to use my Pentax for this but I can't seem to find a flash for this rig. I'll keep my 35mm kit on hand as back up. I need a flash for a lot of things. I was just down in the rainforest in central America and there's not a lot of light under the canopy. Is there a dedicated flash for this camera? What's everyone else using?