Sight adjustment question - standards?

[high_revs]

I guess there's no standards to click value on different sights whether they be red dot, scope or iron sights? Examples below based on what I have but it seems each sight is different.

Vortex strike fire - 1/2" MOA per click. W&E adjustment range 100MOA
Eotech 512.A65 - 1/2" per 100yds (so 1/2" MOA also, right?). +/- 40 MOA travel
SuperSniper 20x42 - 1/4" MOA Target knobs (so basically, 1/4" per click at 100yds?). This is per SuperSniper's website since I can't find my scope manual right now.

I also have a RRA Dominator 2 where my EoTech mounts, and Troy folding Battle Sights. But I can't find info on the click adjustment values of the of either. Anyone know the values and are they the same for all iron sights?

For kicks, I looked at IOR's QR-TS 3x25 and it says 1/4" MOA @ 100yds. And the IOR 3-18x42 says 1/4" MOA click value (so also 1/4" at 100yds, right)?

P.S. My Vortex says W & E adjustment range: 100 M.O.A. Does that mean 100 MOA from center? Or 100 MOA lock to lock (not sure what the right technical term is so I'm using cars LOL).

[kato4moto]

First, take a look at the thread tacked to the top: Reticles--mil vs. MOA.

That should give you the basics.

Different optics have different "click values" because the optics themselves are designed with varying end uses. Typically, the red-dots and holographic sights are intended to be used at comparatively short ranges so they don't really need super-fine adjustments; 1/2 MOA will do fine.

On the other hand, lots of guys shooting precision rifles at extended ranges want the option of adjusting their scopes in fairly minute increments, with 1/4 MOA adjustments being probably the most popular. (And yes, 1/4 MOA is roughly equivalent to 1/4 inch at 100 yards and you can extrapolate from there; i.e. 1/4 MOA will also be close to 1/2 inch at 200 yards, one inch at 400 yards, etc.)

However, in some cases, guys want to be able to dial in elevation (and windage) changes quickly, and will forsake the precision of, say, a 1/4-MOA knob for a 1/2-MOA or even a full 1-MOA knob. It takes fewer "clicks" of the coarser adjusting knob to move the point of impact compared to a fine knob.

Not sure what the value is on the Troy BUIS. Maybe 1/2 MOA? Contact Troy's customer service department.

Finally, the adjustment range generally refers to total adjustment, not from the center. A 100-MOA range is huge and, for most uses, negates the requirement of using a sloped mounting base in order to shoot at extended ranges (like 1000 yards). But that doesn't mean you can't combine a 20-MOA base with a scope featuring lots of adjustability.

It's all about options.

[maxicon]

For iron sights, the MOA adjustment per click depends on the distance between the rear sight and the front sight, which varies with barrel length, so many manufacturers don't spec it.

Since most iron sight knobs aren't used for windage adjustments on the fly like scope turrets are, it's not much of an issue. Generally, you zero them at an appropriate range and leave them zeroed, though some have elevation adjustments.

For most shooters, iron sights won't be used further than a few hundred yards. Zeroing at 50 yards will have you within a few inches from 25 to over 200 yards. If there's a lot of wind, you just have to use Kentucky windage.

[high_revs]

ahh.. great info maxicon and kato4moto (you a kato motogp fan?).

this is good. am learning more.

[kato4moto]

ahh.. great info maxicon and kato4moto (you a kato motogp fan?).

this is good. am learning more.

I appreciate the talents of all the MotoGP racers, though I gave up club racing years ago and now just concentrate on dirt riding. I too am learning all the time; this is another great (though expensive) hobby!