hi,

I just bought NN5 with RD 16 by my friend from USA Nodal ninja. Can everyone tell me the upper rail setting using Nikon D3 with a sigma 8mm f3.5 fisheye?

The lower setting is 86mm, I tested the upper setting from 79mm to 90mm every milimeter, but I can not find the accurate setting ,why?

Thanks in advance.

Tangbinbin