Man, I just won't go away, will I ? I was curious for those of you who have owned the Zeus and Ir defense scopes, how long does it take to power the unit up? I see ir defense says > 4 seconds. I'm thinking I'd leave the unit off, scan with the Pulsar handheld & turn on the scope when coyote is seen. Is this a bad idea? Do they all take a while to fire up & be ready for a shot?