No big deal though broski (you heard me!) this is all anyone really needs to know about optics in paintball anyway:
A) Scopes are useless in paintball.
Now before the snipers blow up on me, I'm not just hatin', and I'm not saying you shouldn't mount one if you want to. By all means, go for it. It's just that, technically speaking, the only reason one needs a scope is to sight in on targets so far away that it's difficult or impossible to clearly see and sight in on them with the naked eye. Any targets that far away are impossible to hit with a paintball. Any targets close enough to hit with a paintball can be seen clearly without any magnification. So yeah, not much point unless you just want it for looks, which is fine.
Optic sights are usefull in paintball.
They can be more accurate than your iron sights because they can be adjusted to reflect your markers grouping, vs the stock iron sights which probably just align in a straight line downrange. Optic sights also make it much easier and faster to sight in on targets, as well as making it possible to maintain an effective aimpoint while on the move. To zero your sight all you have to do is pick a range to zero it for, fire a fairly large amount of paintballs (maybe one bag approx 500 balls) from the marker from a fixed position (and I mean C-clamp kinda fixed not, "I tried not to move around" kinda fixed) at a target wall at the pre-determined range, then without moving the marker adjust the sight's elevation and windage such that the aimpoint retical in the sight appears at the center of the group of paintballs that hit the wall. Now your sight gives you an EXCELLENT point of reference that will tell you where any shot you fire is MOST likely to go. If you buy some decent paint and zero for a reasonable range 50-75 mayyybe 100ft, you could get a grouping not much bigger than the size of a human torso, which means when sighted in on a player's center mass at that range you will be more likely to hit them somewhere in the body than you are not to. Which is AWESOME! A lot of people seem to think that just because paintballs aren't pinpoint accurate means there's no point to aiming them at all, which is ridiculous. If you can fire a paintball and be 75-80% certain it's going to hit the guy, does it freakin' matter if it didn't hit the guy exactly on the aimpoint? No... no it doesn't. And if you can do that, you've already radically improved accuracy over point and shoot guestimation.
Aside from that, at other ranges for which your sight is not zero'd all you have to do is be aware that the range is longer or shorter and adjust your aim accordingly, just apply a little good old fashioned Kentuky windage. So if you're zeroe'd for 75ft and your shooting at someone 100ft away, just be aware that they're farther away and that the paintball is going to be lower by time it gets there, so aim a little bit higher than you normally would. Put the aimpoint on their center mass, then adjust so that it is sighted in on a point maybe a couple feet above the guy's head. Then so long as you've got some lateral consistency you can rest assured the balls gonna fall on the guy... so long as he doesn't see it coming haha!
That's it... that is literally all there is to optics in paintball.
This post has been edited by Shipwreck!: 22 August 2011 - 08:55 PM