I started with an FT2 and then I moved up to an F4s, playing around trying to achieve high reproduction ratios. The TTL control of the flash helped a lot. So did the copy stand I scored for small money. I now have a D600 and SB-910 and I was wondering if there are any red flags I need to consider, different from using my F4s? I have a BR2a as well as an assortment of rings to couple lenses together, 52mm to 52mm mount, lens extensions etc. Any advice from people who have been here before with type of equipment is appreciated.