.22lr Parallax
- Thread starter sprice
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Parallax is a non issue if you are consistent in your cheek weld and eye placement. The more you vary that the more spread you get. So it is kind of hard to say.
I found this:
http://www.thehighroad.org/archive/index.php/t-198321.html
You should be able to move your head around and see it. I find that if the exit pupil is touchy you will see the blackening easily if you are off center in the scope.
I found this:
http://www.thehighroad.org/archive/index.php/t-198321.html
You should be able to move your head around and see it. I find that if the exit pupil is touchy you will see the blackening easily if you are off center in the scope.
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CraigC
Sixgun Nut
It depends. For a field gun, where utmost accuracy is not critical, lower powered variables and fixed scopes up to around 4-5x work fine. I go to no special effort to shoot half inch groups at 50yds with the Leupold 1-4x mounted on my CZ 452FS. Move up to a 3-9x or more and it becomes significant when shooting around 50yds. All of which seems to be exacerbated with cheaper scopes.
madcratebuilder
Member
+1
Every serious .22 target shooter I shoot with uses an AO scope. Not only parallax but clarity of focus is effected when sighting under 100yds.
CraigC
Sixgun Nut
It is very easy to tell when shooting a Browning Buckmark at 50yds when equipped with a Burris 2-7x cranked up to 7x. Regardless of what ammo you're using. Not even worth fooling with.
bhk
Member
Scopes designed for .22s or those with adjustable parallax are best for real accuracy. If you find a centerfire Leupold scope you really like, I know you can send it in to their service station to have the parallax set for whatever distance you prefer for a small fee. They used to do it for free. I had a Leupold 2.5 - 8x adjusted for 50 yards and it sits on my favorite squirrel rifle.
chrome_austex
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Someone posted this formula here a while back
Max parallax error = 0.5 * ObjectiveDiameter * (RangeToTarget - ScopeParallaxRange) / ScopeParallaxRange)
So, if you're shooting at 100y and your objective is 30mm, your scope is set at 60y, then your maximum parallax error is 10mm (thats if your eye is so far out of alignment that your crosshair appears at the very edge of your scope picture.
30mm 60y scope, shooting at 100y = 10mm
40mm 100y scope, shooting at 50y = 10mm
30mm 60y scope, shooting at 200y = 47mm
etc...
Max parallax error = 0.5 * ObjectiveDiameter * (RangeToTarget - ScopeParallaxRange) / ScopeParallaxRange)
So, if you're shooting at 100y and your objective is 30mm, your scope is set at 60y, then your maximum parallax error is 10mm (thats if your eye is so far out of alignment that your crosshair appears at the very edge of your scope picture.
30mm 60y scope, shooting at 100y = 10mm
40mm 100y scope, shooting at 50y = 10mm
30mm 60y scope, shooting at 200y = 47mm
etc...
Red Tornado
Member
Thanks for the formula Chrome. I've been wondering about a 50 yard parallax shooting at Appleseed distance, 25 yards. Apparently the max error will be 8mm. I'm pretty sure I can line up a little better than that, so presumably less than 8mm.
Sweet,
RT
Sweet,
RT
Sako Shooter
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I had a Leupold VXII w/set parallax at 60 yards. I upgraded to a VX3 with AO down to 25 yards. The Leupold rep. advised that from 60 yards to 25 yards the parallax would be at maximum 1/4". This is maximum error, not guaranteed, as potential parallax is based on a number of factors. I did note a slight increse in accuracy when I made the switch, but the most notable effect was clarity at all ranges. To a target shooter 1/4" is huge, to a hunter, not so much. I have upgraded all my rimfire scopes to AO and would not go back if that tells you anything.
chrome_austex
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1/4 at 25y (from 60y) is a fair approximation for worst-case at those ranges. I would say the leupold rep knew what he was talking about.
I would estimate that most people are looking at 1/10th of an inch of parallax error (assuming 20% error in eye alignment with the scope's axis) at 25y for a scope set at 60y. Hey, anyone want to prove that formula correct by shooting a testcase at the range?
I would estimate that most people are looking at 1/10th of an inch of parallax error (assuming 20% error in eye alignment with the scope's axis) at 25y for a scope set at 60y. Hey, anyone want to prove that formula correct by shooting a testcase at the range?
I've observed that some scopes show greater error than others. Some centerfire scopes are factory-set for 150 yards, so shooting them less 50 yards can make a big difference in POI and clarity.
It seems that scopes with larger objectives, like 45-50mm, show greater variation in sighting error than scopes with smaller objectives. As I grow older, my eye's tolerance for scope focus is more critical, so centerfire scopes don't work for me at close range as well as they used to.
One way to make centerfire scopes more accurate and clear at shorter ranges, though somewhat dimmer, is to cut a piece of thin cardboard to fit the objective and tape it on. That increases depth of field by using the lens center, instead of the whole lens. Light rays are more parallel, so parallax is minimized and the target is clear as well. That doesn't work as well in low-light situations, but helps when shooting at the range.
It seems that scopes with larger objectives, like 45-50mm, show greater variation in sighting error than scopes with smaller objectives. As I grow older, my eye's tolerance for scope focus is more critical, so centerfire scopes don't work for me at close range as well as they used to.
One way to make centerfire scopes more accurate and clear at shorter ranges, though somewhat dimmer, is to cut a piece of thin cardboard to fit the objective and tape it on. That increases depth of field by using the lens center, instead of the whole lens. Light rays are more parallel, so parallax is minimized and the target is clear as well. That doesn't work as well in low-light situations, but helps when shooting at the range.
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