So I recently inherited an old Starblitz 3600BTZ flash. I figured that since its trigger voltage is way too high to be safe on a modern camera that it was going to be useless...but it turns out that it has a slave mode. So that's cool. I was hoping to be able to use it off-camera with an optical slave set-up using the pop-up flash on my GX1. However, in testing I found that the off camera flash never actually shows up in the photos. The reason being that since it's an old film flash, it automatically fires when the metering pre-flash. There are plenty of kludgey ways to get around this, like turning my GX1 on to 2nd flash synchro mode, manually blocking the first metering flash (with my hand), and then exposing it again so that the 2nd synch can trigger the off-camera. But life is too short for something so stupid as that. So is there any way to disable the pre-flash on the GX1? (Or on the GX7, since I may upgrade to that in the coming months). It seems like a useful feature, and a bit of an oversight if I can't. Honestly I don't really need a flash, but I was hoping to have some fun with this, since it was free and is actually a pretty cool flash. Powerful, lots of manual settings, and good bouncing functionality.