Re: NF FFP questions
While I won't speak for NF....... but I can speak about scopes in general.
A FFP reticle will grow and shrink as the power is dialed on and off always retaining the correct dimension.
A SFP reticle will remain the same size throughout the power range and the FOV (field of view) will contract and expand as the power is dialed on and off.
The advantages of a FFP scope are simply that the reticle will always subtend the same measurement while the SFP scope will only subtend correctly at one power(usually the highest). These trait are important when "milling" for UKD ranging and when holding for leads and follow up shots. Night Vision operations also are improved with a FFP reticle.
Cheers,
Doc