Let me ask this another way .
One of the disadvantages of a FFP scope is how small the reticle appears at very low power in a variable power scope. The reticle in a SFP scope doesn't appear small and Of course doesn't change size, so it must be magnified to a certain extent ?
In a SFP scope the reticle is between your eye and where the magnification occurs. Making it static. In a FFP it’s after the magnification so it changes sizes with the magnification.
