flashdot projects dot on to reticule. When switched off it you see no dot on the reticule. Flashdot is very bright and can be used as a red dot in day use for running game.
Reticule of say FD7 is very fine and can be used for target or vermin, at dusk put a bit of dot on. Most versitile reticule.
I love my 3-12x50 FD7 zenith, just would like the bdc turrets.