Loose, wiggling, "play-ful" eyepiece on your scope?

Forums Optics, Scopes, Rings, & Mounts Loose, wiggling, "play-ful" eyepiece on your scope?

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    spinj
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    I was reading a few posts on other forums a couple of days ago from people who complain about their scope’s ocular lens (also known as a fast-focus eyepiece) having some play or wiggle when turning it clockwise or counterclockwise because it doesn’t have a lock ring, which, as they claim, consequently, would cause point-of-impact shift.  Moreover, they’ve reported that when turning the objective bell, they’ve witnessed the reticle moving.  

    Even with a moving eyepiece, when you adjust your scope to correct for parallax error, the entire sight picture moves in relation to the movement of the eyepiece.  If you’re not viewing the sight picture with the rifle kept still–by clamping it on a vice or putting it on a completely steady rest–you’d think that you’ll end up with missed shots.  But if you clamp your gun to a steady rest or vice, provided you’ve eliminated parallax error, you’ll discover that when you move the eyepiece it would seem like the sight picture is a still frame being repositioned with the reticle absolutely planted on the point of aim.  To sum it all up, your scope is not defective.

    Cheers and shoot straight!

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    BigTinBoat
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    What happens with a non AO?

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    spinj
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    “BigTinBoat”What happens with a non AO?

    
Then, obviously, you’ll have to make sure you have a consistent cheek weld.  The trick is that when viewing through your scope, you should have a ring that has equal thickness all around between the internal and external edge of the eyepiece as shown in the photo below (photo is not mine).  When you do this every time—make sure you’ve zeroed your scope doing this, most especially—you’ll have no problem with parallax effects.

    Consistency is the key in all that you do when the goal is to shoot with precision.

     

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    spinj
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    “AirGunShooter”If a person is worried about the movement of a non-locking eyepiece, try the following.
    Adjust the eyepiece to where you want it to, then install one or more large (enough) diameter o-rings in the gap between the eyepiece and the scope body.  Install enough o-rings so that when you tighten the eyepiece against them, it does not change the focus or is very close to the focus setting.  A little trial and error of o-ring diameters and cross-section diameters should allow you to find a combination which tightens to the proper width.


    That is also a good way to keep the eyepiece from moving. Great idea!

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    nced
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    PVC electrical tape also works to steady the “fast focus eye piece”…………

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