Ok, quick guide and remember this is only my opinion.
Mirrors are of no use set to look at the sky, the chances of you being strafed by a stray Stuka dive bomber are slim.
In all cases you only want to see your own lorry in about 10% of the mirror, you can go wider still to just a sliver but sometimes its handy to have easy vision of whats going on at the wheels as well, too wide and you lose that.
Main mirrors set so you can see the top of the rear of the body at the top of the mirror, that should give you a view right down to about 6ft from the back of the steering wheels and nice field of view.
For artics and lorry/drag, learn how and which way to move the ns mirror out for blind side reverses and judge the exact moment to bring the mirror back in gradually as you straighten back up, this takes a bit more practice than you think, cos for some reason you, well me if truth be told
automatically try to push it further out the wrong way straightening.
The wide angle mirror can take over up to a point but is usually too convex (unless you have the eyes of a hawk) for accurate vision as far back as the end of the trailer, obviously worse in the dark.
Wide angle mirrors set so you can see the horizontal at the top of the mirror, then they should cover right down to near enough the wheelnuts on your steer wheels.
NS down mirror set more or less central and again as far out as possible, you can always fiddle about a bit with fore and aft preference depending on the lorry.
(note one thing i like about MAN’s, even that ns down mirror is electric, not seized solid in place like Scania down mirrors after one winter
, they are made in a country where its cold arn’t they?
Front down mirror set to catch the whole of the front end and scanning roughly 6ft out the side and down the NS, assuming its not located in the centre of the screen like some Daf rigids, this should be possible.
This is only a rough guide, you’ll make adjustments along the way as you go on, each mirror should overlap the field of view and compliment each other, those pics of all the cyclists beside the lorry invisible to to the driver used in every DCPC module for shock factor (yawn) are only possible if an idiot sets the mirrors poorly.
One important thing about visibility is to keep those mirrors and the windows spotlessly clean at all times, helps to ensure maximum leching potential too, so i’m told.
PS if you keep the bodywork clean and shiny too its surprising how often you get early warning reflections in your peripheral vision before something comes into mirror view.