My understanding of the optical advantage for me of FFP is that there is no reticle movement when changing the power of the scope vs SFP where there is usually some sort of variation of reticle position when changing power. This is also what I have observed when checking scope tracking with a collimator. Pecar made a FFP hunting reticle (#16) which had tapered cross hairs: there was no particular sense of reticle size change when changing the power of the scope (1.5-6x) which is an off-putting aspect of FFP scopes.
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