Could someone clear up my confusion about what Nikon mounts will work with either the Novoflex or Speedbooster adaptors? Having bought and absolutely love the Samyang/Rokinon 85mm T1.5, I'm keen to start scouring eBay and garage sales for some other gems! Trouble is I'm a tad confused about what mounts I should look for and which I should avoid. I think it's just F and G, but could someone set me straight please?