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Joined: Oct 2004
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Campfire Ranger
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Campfire Ranger
Joined: Oct 2004
Posts: 26,616 Likes: 20 |
I have accepted that I will go to my grave with much of parallax remaining a mystery to me. Are you saying you don't understand it from the point of view of experiencing it, or the more technical aspects of what causes it and how to get rid of it or mitigate its effects? The latter. I see it when I am am cozying up to my stock and getting settled in. I don't understand what happens in the scope when a fixed parallax scope has the parallax adjusted from say 100 to 50 yards. Or when the parallax adjustment is moved through its range
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Joined: Jan 2010
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Campfire 'Bwana
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Campfire 'Bwana
Joined: Jan 2010
Posts: 32,130 Likes: 1 |
The parallax adjustment mechanism positions the target image relative to the reticle image inside the optic. In a fixed parallax optic, the image of whatever is in the FOV at the distance parallax is set, will be in the same plane as the reticle image inside the optic.
If you put Taco Bell sauce in your ramen noodles it tastes just like poverty
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Joined: Oct 2011
Posts: 1,935
Campfire Regular
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Campfire Regular
Joined: Oct 2011
Posts: 1,935 |
I have accepted that I will go to my grave with much of parallax remaining a mystery to me. Are you saying you don't understand it from the point of view of experiencing it, or the more technical aspects of what causes it and how to get rid of it or mitigate its effects? The latter. I see it when I am am cozying up to my stock and getting settled in. I don't understand what happens in the scope when a fixed parallax scope has the parallax adjusted from say 100 to 50 yards. Or when the parallax adjustment is moved through its range The goal is to get the image of the reticle and the target on the same focal plane. Apparently, it can be done more than one way. This is why there are adjustable objectives (move the objective lens fore and aft), side focus (which does it with another lens, not the objective), and the SWFA fixed power scopes that have the parallax adjustment where most variable scopes have the magnification adjustment (yet another way to do it.) Probably the easiest to understand is the adjustable objective, and I believe moving the objective fore and aft is how most scopes that are parallax free at only one distance are adjusted. I don't understand optics well enough to know exactly how it works, much less try to explain it, and much, much less in easier to understand terms. There is also the trick Dirtfarmer suggested, although that probably works well only on a bench.
Clinging to guns & religion since 1959
Keyboards make people braver than alcohol
Election Integrity is more important than Election Convenience
Washington Post: "Democracy Dies in Darkness" More correct: "Killing Democracy Faster Than Darkness"
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Joined: Jun 2004
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Campfire Outfitter
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Campfire Outfitter
Joined: Jun 2004
Posts: 11,117 Likes: 2 |
Place an objective lens so that it casts an image on a ground glass. In line, place an ocular lens of shorter focal length behind the glass, so that the image on the ground glass is magnified. This is your basic two-lens telescope. While looking through the ocular, remove the ground glass. Nothing changes except that the image becomes more crisp as the texture of the ground glass goes away. The point is, the real image formed by the objective lens is still in the same plane in space, whether the ground glass is there or not.
If that real image in space is in the same plane as the reticle, there will be no parallax. If it's not in the same plane, the reticle will move with respect to the image as you move your eye left/right, up/down. The parallax adjustment on an adjustable objective scope allows you to move the real image forward and back, so that it's in the same plane as the reticle.
Last edited by denton; 07/18/19.
Be not weary in well doing.
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Joined: Feb 2007
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Campfire Outfitter
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Campfire Outfitter
Joined: Feb 2007
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Is something we worry about more than necessary. Some quotes from a Leupold owners manual. Maximum parallax occurs when your eye is at the very edge of the exit pupil. Our 4X hunting scope focused for 150 yards has a maximum error of only 8/10ths of an inch at 500 yards.) at 100 yards, the maximum error is less than 2/10ths of an inch.) It is also good to remember that, as long as you are sighting straight through the middle of the scope, or close to it, parallax will have virtually no effect on accuracy in a hunting situation
Most people don't really want the truth.
They just want constant reassurance that what they believe is the truth.
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Campfire Tracker
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Campfire Tracker
Joined: May 2011
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It is significantly worse than that at higher powers though - you can see this by moving your head around behind a rifle on bags, where there is a parallax error.
Whatever you said...everyone knows you are a lying jerk. That's a bold assertion. Point out where you think I lied. Well?
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Campfire Regular
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Campfire Regular
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It can also get bad "up close", say 25 yards, if you are shooting very small targets with a .22 up close.
Clinging to guns & religion since 1959
Keyboards make people braver than alcohol
Election Integrity is more important than Election Convenience
Washington Post: "Democracy Dies in Darkness" More correct: "Killing Democracy Faster Than Darkness"
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