Yes, you are absolutely right. I was watching on youtube about this, and my understanding is clearer. I think it will be enough for what I need. 8)mrfoo wrote:If you're playing at 12 meters, 1 arc minute (one click) is equivalent to 3.5mm.

Comes from trigonometry. SOH CAH TOA ,if you remember your schoolin'. For a right angled triangle, the tangent of one of the non-right angles is equal to the length of the side opposite that angle divided by the adjacent side. One arc-minute is equal to 1/60 degree (and an arc-second is equal to 1/60 arc-minute).

tan (1 / 60) = offset / distance to target

thus

offset = distance to target * tan (1/60)

Obviously, you need to choose units to fit the likely offset, which will mean upscaling your distance to target - 12m = 12000mm.

I understand that this type of gun pointer works just like a laser that really illuminates the target. The difference is that this point APPEARS to be in the objective. Visually, for the eye, it is the same. Of course, at 50 meters, as an example, a point of light on a target is more difficult to see, if it is under the sun, much more, an issue that does not happen with a reflex sight, because the red or green point is very close Of the eye, and isolated from the strong exterior light by the viewfinder tube.