NN3 or NN4? The NN3 is suitable for small digital cameras and SLR. The NN4 is suitable for all types of cameras and lens over 100mm. This latter, is ideal for those starting out with a small digital body camera then evolve into a bigger one. > Learn more | What the R-3DL is? The rotator R-3DL EZ Leveller II is a leveller rotator. Its 3 big knobs, go between top of tripod and panoramic head. With that accessory, you'll get your Nodal Ninja at level in just a snap. > Learn more | Adapter T, essential? Universal T adapter is needed if you use a camera with screw hole not aligned with lens axe (mainly non DSLR consumer cameras). > Learn more |