Have another question:
On the GX680 V2(II), how hard is it to find a AA battery adapter?
Thays the primary reason I'm leaning towards the VIII model, since a AA holder is readily available, and seemingly quite common.
Stay with the III. It uses 2 cr123 lithium batteries ormthe AA holder. I have three bodies and about 10 lenses, all the finders, the AA holder. I have bought most of it from a great guy in Saitama, Japan. He has an eBay store, his handle is : astrosmith22....Probably the best eBay seller I've dealt with.