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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Parallax vs Focus
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<blockquote data-quote="Bart B" data-source="post: 96759" data-attributes="member: 5302"><p>OK, Sheephunter. Next is focusing on the target.</p><p></p><p>If you take that piece of paper with the '+' drawn on one side then use a low power magnifying glass to focus a bright image (such as a lamp or light bulb in your house) on the side opposite the +, this is how the objective lens works. Focusing your rifle scope's front lens does the very same thing.</p><p></p><p>When your scope's front lens focuses a distant target on the reticule, your eye is focused on the reticule from the back. This is how a scope works.</p><p></p><p>To focus your scope on a distant target, rest the scope on something so it points at something exactly 100 yards away. Then without touching the scope, look through it and move your aiming eye around. If the reticule appears to move around the aiming point, your scope is not focused at 100 yards. This is parallax; the scope's front lens is not focused to the same range as the target.</p><p></p><p>Change the front lens focus a bit, then look through it again moving your aiming eye around. </p><p></p><p>If there's more reticule movement than before, you moved the front lens focus the wrong way; move it back the other way past the point where it was to start with.</p><p></p><p>If there's less reticule movement than before, you've moved the focus in the correct direction but need to move it some more.</p><p></p><p>Refine the focus adjustment so there is no reticule movement about the 100-yard target when you move your eye around looking through the scope. When this is done, your scope is focused properly for 100 yards.</p><p></p><p>How's this sound? Think you got it now?</p></blockquote><p></p>
[QUOTE="Bart B, post: 96759, member: 5302"] OK, Sheephunter. Next is focusing on the target. If you take that piece of paper with the '+' drawn on one side then use a low power magnifying glass to focus a bright image (such as a lamp or light bulb in your house) on the side opposite the +, this is how the objective lens works. Focusing your rifle scope's front lens does the very same thing. When your scope's front lens focuses a distant target on the reticule, your eye is focused on the reticule from the back. This is how a scope works. To focus your scope on a distant target, rest the scope on something so it points at something exactly 100 yards away. Then without touching the scope, look through it and move your aiming eye around. If the reticule appears to move around the aiming point, your scope is not focused at 100 yards. This is parallax; the scope's front lens is not focused to the same range as the target. Change the front lens focus a bit, then look through it again moving your aiming eye around. If there's more reticule movement than before, you moved the front lens focus the wrong way; move it back the other way past the point where it was to start with. If there's less reticule movement than before, you've moved the focus in the correct direction but need to move it some more. Refine the focus adjustment so there is no reticule movement about the 100-yard target when you move your eye around looking through the scope. When this is done, your scope is focused properly for 100 yards. How's this sound? Think you got it now? [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Parallax vs Focus
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