I plan to use my canon 7d and Samyang (Rokinon) 8mm lens for occasional pano/hdr work, and considering either a new NN3 starter kit or a used NN SPH-2. I think the older model would probably be sufficient for my needs due to how infrequently I'd actually use it, but not sure about how it would handle the weight and size of my camera & lens combo compared to the NN3 MKII. From what I've read the NN3is stronger and has longer rails.

I can get the used SPH-2 for less than half of new NN3 price, but don't want to waste time and money on something that won't work. Any advice appreciated.