How do you measure parallax in a scope

[guninhand]

Is there any way to measure with precision the amount of parallax a scope has at a particular range? I know you can look through the scope, move your head from side to side and watch the crosshairs move around on the target when parallax is there.

I would like to know if it can be measured exactly.

 

[jjohnwm]

I'm just guessing here, but it seems to me that by aiming dead centre on one of the sighting-in targets with 1" grids, you could move your eye as far off centre as you could to the left, note the location of the crosshair on the grid, then repeat after moving as far as possible to the right. The grid should (would? might?) make it easy (possible?) to see how much parallax could be developing at that particular target distance.

The gun would have to be firmly supported to remain perfectly still while your head is dancing around behind it.

This is kind of an interesting question. I'm gonna have to try it.

John

 

[Johan22]

John has it right. Take a cardboard box and cut 2 "V's" on opposite sides and support the rifle in the v's. At the advertised range, 100 yards in most cases for big-game scopes, there should be no vertical or horizintal movement.