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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: 94903" data-attributes="member: 5302"><p>Jon A, you should first focus the eyepiece such that your aiming eye gets perfect instant focus on the reticule. Our eyes nature is to automatically and instantly focus on what we're looking at. After the eyepiece is set correctly for your aiming eye, then move on to focusing the scope's front lens at the target's range. This is the best/only way to set up the scope for ones aiming eye.</p><p></p><p>Here's how to do it correctly:</p><p></p><p>1. Unlock, then back out (unscrew) the scope's eyepiece to where the reticule appears fuzzy or out of focus when you look through the scope for only 1 second.</p><p></p><p>2. Screw the eyepiece in one turn, then with both eyes, look at something about 100 yards away. While looking at that 100-yard point, move the scope quickly to your aiming eye then look through it for only 1 second, then put the scope down. If the reticule appeared fuzzy, screw the eyepiece in one more turn, then repeat this step. If the reticule starts appearing sharper, go on to step 3.</p><p></p><p>3. Screw the eyepiece in one-half turn, then with both eyes, look at something about 100 yards away. While looking at that 100-yard point, move the scope to your aiming eye then look through it for only 1 second, then put the scope down. If the reticule still appeared a little fuzzy, screw the eyepiece in one more half-turn, then repeat this step. When the reticule appears very sharp the instant you look through the scope, go on to step 4.</p><p></p><p>4. Lock the eyepiece in place. Don't ever move it unless your eyesight changes (new perscription for your glasses, etc.).</p><p></p><p>5. Put the scope in or on something that holds it still while you look through it at a target exactly 100 yards away (yes, measure off the distance to do it). Set the scope's focus for 100 yards (if marked, otherwise use your best guess).</p><p></p><p>6. Look through the scope with the reticule on the target then move your eye around and look for relative movement between the reticule and target. If the reticule doesn't stay on the target, change the scope focus a small amount then retest. Repeat this step until moving your eye around looking through the stationary scope shows no relative movement between the target and reticule. Then go on to step 7.</p><p></p><p>7. Note where the 100-yard mark on the objective lens focus is relative to the index mark. Make a new index mark at the 100-yard line. This is your particular scope's new index mark. Cover up the old one with something. When you set the scope's infinity setting at this new index mark, the scope will be focused pretty close to infinity. And setting any other range mark to this new index should result in zero parallax at that range.</p></blockquote><p></p>
[QUOTE="Bart B, post: 94903, member: 5302"] Jon A, you should first focus the eyepiece such that your aiming eye gets perfect instant focus on the reticule. Our eyes nature is to automatically and instantly focus on what we're looking at. After the eyepiece is set correctly for your aiming eye, then move on to focusing the scope's front lens at the target's range. This is the best/only way to set up the scope for ones aiming eye. Here's how to do it correctly: 1. Unlock, then back out (unscrew) the scope's eyepiece to where the reticule appears fuzzy or out of focus when you look through the scope for only 1 second. 2. Screw the eyepiece in one turn, then with both eyes, look at something about 100 yards away. While looking at that 100-yard point, move the scope quickly to your aiming eye then look through it for only 1 second, then put the scope down. If the reticule appeared fuzzy, screw the eyepiece in one more turn, then repeat this step. If the reticule starts appearing sharper, go on to step 3. 3. Screw the eyepiece in one-half turn, then with both eyes, look at something about 100 yards away. While looking at that 100-yard point, move the scope to your aiming eye then look through it for only 1 second, then put the scope down. If the reticule still appeared a little fuzzy, screw the eyepiece in one more half-turn, then repeat this step. When the reticule appears very sharp the instant you look through the scope, go on to step 4. 4. Lock the eyepiece in place. Don't ever move it unless your eyesight changes (new perscription for your glasses, etc.). 5. Put the scope in or on something that holds it still while you look through it at a target exactly 100 yards away (yes, measure off the distance to do it). Set the scope's focus for 100 yards (if marked, otherwise use your best guess). 6. Look through the scope with the reticule on the target then move your eye around and look for relative movement between the reticule and target. If the reticule doesn't stay on the target, change the scope focus a small amount then retest. Repeat this step until moving your eye around looking through the stationary scope shows no relative movement between the target and reticule. Then go on to step 7. 7. Note where the 100-yard mark on the objective lens focus is relative to the index mark. Make a new index mark at the 100-yard line. This is your particular scope's new index mark. Cover up the old one with something. When you set the scope's infinity setting at this new index mark, the scope will be focused pretty close to infinity. And setting any other range mark to this new index should result in zero parallax at that range. [/QUOTE]
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Parallax vs Focus
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