Hi, I've been talking to someone about purchasing a lens, and it's pretty much a done deal, but I just noticed at the last second, that it didn't look quite right. (I'd read as much as I could about the lens before making an offer). It seems to have only one of it's contact points for a flash, not normally a big deal, but then I also noticed, in reviews of this lens, that it's almost always pictured with a "flash supermatic" shutter. I'd like to make certain I know the differences between these two lens/shutters before I finalise the sale. Was there a difference in age/build quality? Is it going to be impossible to ever use a flash with this combo? Is there a significant difference in resale value? Any advice you guys could offer would be greatly appreciated, as I'd not like to keep the potential seller waiting long.