TRACT Optics

Magnification vs parallax

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  • DustyDog

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    This is one of the reasons I like fixed optics. 3x or 4x. Zero at 100 or 50 and work the rest out in my head.
    Or, like on my Barska 6-24x (I have two identical, one on a .223 bolt gun, and one on a .22 LR bolt gun), I just leave it on 10x, which leaves it plenty bright, with good definition, and that's the magnification at which the reticle element dimensions are valid (pic below), so I can use them for compensation/range-finding. The one on my .22 LR just so happens to give me just a little more than enough in-reticle drop compensation for standard velocity rounds @ 200 yds. from a 100 yd. zero.. as long as there's not too much headwind : )
     

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    Don357

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    I'm still here, just been busy. My scope is a 2x6x28 Nc Star compact. It's mounted on my AR15 via a removable carry handle and mount. With the rifle in a vice, using a muzzle type laser, and the scope "zeroed" on the dot at 25 yds on 2x, the POA moves down and to the left when I increase mag to 6x. If I zero on the dot at 6x, the POA moves up and to the right when I decrease to 2x. I finally set it to 6x, zeroed it there and left it. As long as I don't touch the magnification it seems to work fine. Comments?
     

    Bowhntr6pt

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    I'm still here, just been busy. My scope is a 2x6x28 Nc Star compact. It's mounted on my AR15 via a removable carry handle and mount. With the rifle in a vice, using a muzzle type laser, and the scope "zeroed" on the dot at 25 yds on 2x, the POA moves down and to the left when I increase mag to 6x. If I zero on the dot at 6x, the POA moves up and to the right when I decrease to 2x. I finally set it to 6x, zeroed it there and left it. As long as I don't touch the magnification it seems to work fine. Comments?

    Like I said... inexpensive things doing inexpensive stuff.

    Remember, your scope is your aiming solution, other than a range toy with zero expectations for performance, why would you keep let alone use an aiming device you know is faulty?
     

    DustyDog

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    I'm still here, just been busy. My scope is a 2x6x28 Nc Star compact. It's mounted on my AR15 via a removable carry handle and mount. With the rifle in a vice, using a muzzle type laser, and the scope "zeroed" on the dot at 25 yds on 2x, the POA moves down and to the left when I increase mag to 6x. If I zero on the dot at 6x, the POA moves up and to the right when I decrease to 2x. I finally set it to 6x, zeroed it there and left it. As long as I don't touch the magnification it seems to work fine. Comments?
    I would like to know what it does on the range (what you're describing sounds like bore-sighting only), since it's a rare sled or vise that can completely immobilize a rifle. And if it's not completely immobilized, twisting the magnification ring one way will move the POA one direction, and twisting the opposite way will move the POA in the opposite direction. But remember, the laser doesn't actually tell you where the rifle is hitting. If you zero it at 6x at 100 yds. or so by test-firing, not via the laser, then move the magnification to 2x, what happens to your POI?

    I fought a .22 LR (pic below; same scope that's on my .223 Savage) for a year and a half, in the beginning thinking the "cheap" scope must be defective, and ended up being pretty confident in hitting a 3-inch dot at 200 yds. with the first shot... wind permitting : ) There were a lot of other issues at play, although I still won't crank my knobs unless absolutely necessary... and it almost never is, despite the turrets being only 1/8 MOA. Yes, you do (generally) get what you pay for.

    And if it turns out that it does have crappy internals, I would prefer to set up near the bottom of the magnification range rather than the top. If the scope is actually defective, I'd return/warranty it if possible.
     

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