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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
How Does Side Focus Work Exactly?
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<blockquote data-quote="boomtube" data-source="post: 223473" data-attributes="member: 9215"><p>Mike is correct and gives you some good advise. </p><p> </p><p>It is very important to do as he says when focusing the ocular lens. The objective (front) lens is adjusted by the factory to project an image on the cross wires at the factory by non-AO scopes, usually at 150 yards for hunting scopes. </p><p> </p><p>To make your eye also focus on the cross wire is best done by looking at a blank wall, or sky as he suggests. Since our eyes tend to "pull" into focus if we look at anything for long we must limit ourselves to brief looks at the cross wire while adjusting the objective. When it appears to be in immediate sharp focus when you look at it, you are done.</p><p> </p><p>The AO allows us to change the parallax at any distance by changing the focus for that specific range. Be aware than the calibration marks for any scope are only approximations, YOU will have to make it right for your situation. To do it, first pick a specific small target at your distance, then move your head from side to side, left and right. Staring is okay here! If the cross wires seem to move in relationship to the target adjust the scope until the appearent shift is corrected. </p><p> </p><p>Understand that parallax is of no consequence IF we hole our eye directly in the center line of the scope. Parallax ONLY comes into play when we are looking off-center at the target.</p><p> </p><p>"Tighten the ring" is refering to the narrow locking ring immediately in front of the objective housing. Snug it up so the objective can't be turned off focus too easily.</p></blockquote><p></p>
[QUOTE="boomtube, post: 223473, member: 9215"] Mike is correct and gives you some good advise. It is very important to do as he says when focusing the ocular lens. The objective (front) lens is adjusted by the factory to project an image on the cross wires at the factory by non-AO scopes, usually at 150 yards for hunting scopes. To make your eye also focus on the cross wire is best done by looking at a blank wall, or sky as he suggests. Since our eyes tend to "pull" into focus if we look at anything for long we must limit ourselves to brief looks at the cross wire while adjusting the objective. When it appears to be in immediate sharp focus when you look at it, you are done. The AO allows us to change the parallax at any distance by changing the focus for that specific range. Be aware than the calibration marks for any scope are only approximations, YOU will have to make it right for your situation. To do it, first pick a specific small target at your distance, then move your head from side to side, left and right. Staring is okay here! If the cross wires seem to move in relationship to the target adjust the scope until the appearent shift is corrected. Understand that parallax is of no consequence IF we hole our eye directly in the center line of the scope. Parallax ONLY comes into play when we are looking off-center at the target. "Tighten the ring" is refering to the narrow locking ring immediately in front of the objective housing. Snug it up so the objective can't be turned off focus too easily. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
How Does Side Focus Work Exactly?
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