Our most frequently asked question. The simplified answer:
NN3 series: small cameras, crop sensor DSLR's, MFT, lenses up to 50mm.
NN6 series: All small cameras and DSLR's with lenses up to 200mm.
R Series: All cameras, mounts to fisheye lens, best for standard shooting workflows.
M Series: Pro-level, all cameras, Arca-Swiss, most versatile, lenses up to 700mm
Each series comes with 30 day return policy (see terms)+ 5yr warranty.