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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Parallax vs Focus
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<blockquote data-quote="hareng" data-source="post: 721936" data-attributes="member: 4422"><p>Also come back to this thread after many years and must correct.</p><p></p><p>[ QUOTE ]</p><p>Regarding my previous post I was hoping for some response from Dave and Catshooter</p><p>Hey guys! I read your string of posts and found them quite informative as I am currently setting up my new Leo Vari-XIII 3.5-10x40 LR M3. I used Catshooters instructions for setting up the scope and ran into an issue when trying to zero the AO side knob. I focused in on an object at aprox 400M (the farthest I could conveniently find without obstruction) and played with the AO knob as Catshooter instructed. I started at infinity and worked my way back until I was parallax free. I was concerned that this point was at the middle dot on the adjustment knob so I went thru the process again starting back at infinity. The result was the same so I loosened the screws and reset the knob so infinity lined up with the hash mark. Now the knob bottoms out at the low magnification end around the second dot and consequently turns way past the infinity mark on the top end. I called Leupold to ask their feedback and the WOMAN who answered the tech line basically said that the knob is set at the factory and not meant to be adjusted. I obviously mentioned that there is adjustment screws on the knob which usually means they are there to enable adjustment but she stuck to her limited insight. [/ QUOTE ]</p><p></p><p>What you have done there is physically move the label ring, nothing else. Who ever told you to do that wants sacking. ie the 400 yard marking may have been 600 yards but you have moved it so it lines up with previous 600 and therefore the last 1/4 rev may be lost.</p><p>As Dogzilla said, no scope produced to date will have the marks line up, mark them yourself been doing so for 21 years.</p><p></p><p>There is absolutely and categorically no reason to move focus to infinity then go down to the range. Some misconception i reckon theres backlash when not! If there is backlash, what happens when you move the focus adjuster? I'll tell you, it takes up any play first so cannot be backlash, its taken up on initial movement.</p><p>Of the hundreds i know everyone focus going up in range, ie 50 yards to what you intend to see.</p><p></p><p>There was someone ask whether could leave scope set at a certain distance for all ranges = no.</p><p>Whats the point in buying a pa adjustable scope if not prepared to adjust focus for every range.</p><p>One of my scopes if left focus set at 400 yards, i would only just about see 370 to 440 yards in the sense its a shallow field of view.</p><p></p><p>What you should be doing is ignoring the range markings and adjusting the focus so target is in focus. Not just set some where.</p></blockquote><p></p>
[QUOTE="hareng, post: 721936, member: 4422"] Also come back to this thread after many years and must correct. [ QUOTE ] Regarding my previous post I was hoping for some response from Dave and Catshooter Hey guys! I read your string of posts and found them quite informative as I am currently setting up my new Leo Vari-XIII 3.5-10x40 LR M3. I used Catshooters instructions for setting up the scope and ran into an issue when trying to zero the AO side knob. I focused in on an object at aprox 400M (the farthest I could conveniently find without obstruction) and played with the AO knob as Catshooter instructed. I started at infinity and worked my way back until I was parallax free. I was concerned that this point was at the middle dot on the adjustment knob so I went thru the process again starting back at infinity. The result was the same so I loosened the screws and reset the knob so infinity lined up with the hash mark. Now the knob bottoms out at the low magnification end around the second dot and consequently turns way past the infinity mark on the top end. I called Leupold to ask their feedback and the WOMAN who answered the tech line basically said that the knob is set at the factory and not meant to be adjusted. I obviously mentioned that there is adjustment screws on the knob which usually means they are there to enable adjustment but she stuck to her limited insight. [/ QUOTE ] What you have done there is physically move the label ring, nothing else. Who ever told you to do that wants sacking. ie the 400 yard marking may have been 600 yards but you have moved it so it lines up with previous 600 and therefore the last 1/4 rev may be lost. As Dogzilla said, no scope produced to date will have the marks line up, mark them yourself been doing so for 21 years. There is absolutely and categorically no reason to move focus to infinity then go down to the range. Some misconception i reckon theres backlash when not! If there is backlash, what happens when you move the focus adjuster? I'll tell you, it takes up any play first so cannot be backlash, its taken up on initial movement. Of the hundreds i know everyone focus going up in range, ie 50 yards to what you intend to see. There was someone ask whether could leave scope set at a certain distance for all ranges = no. Whats the point in buying a pa adjustable scope if not prepared to adjust focus for every range. One of my scopes if left focus set at 400 yards, i would only just about see 370 to 440 yards in the sense its a shallow field of view. What you should be doing is ignoring the range markings and adjusting the focus so target is in focus. Not just set some where. [/QUOTE]
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