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A parallax question for veteran shooters

 
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  #8  
Old 09-10-2012, 10:11 PM
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Re: A parallax question for veteran shooters

I have a 3.5 x 10 40mm VX 3 I had the parallax changed from 150 yds to 200 yds and at 500 yds it went from max parallax 1.8 to 1.2 inches a improvement of a whopping .6 inch. But if you keep the ( Nut ) your head centered no error is correct. Just a little FYI at 800 yds it went from 3.4 to 2.4 a gain of one inch.
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  #9  
Old 09-11-2012, 04:12 AM
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Re: A parallax question for veteran shooters

Quote:
Originally Posted by 1100 Remington Man View Post
I had the parallax changed from 150 yds to 200 yds and at 500 yds it went from max parallax 1.8 to 1.2 inches a improvement of a whopping .6 inch.
Never heard of this stuff.

Are you saying the maximum reticule shift on the 500 yard target from eye movement, after focusing the scope from 150 to 200 yards, went from 1.8 inches down to 1.2 inches?

How did you measure it to get 1/10th inch resolution?

It's confusing to me when you first say parallax was changed 50 yards then later say it changed 6/10ths of an inch some 300 yards further away.
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  #10  
Old 09-11-2012, 06:16 AM
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Re: A parallax question for veteran shooters

I have done a lot of 500 yard shooting with my Mil spec 308 using Leupold scopes with and without parallax adjustments. The fixed parallax scopes were factory adjusted to 150 yards. It's not very acientific but my typical group size measured on multiple outings using my Mark 4 and adjusting for parallax was 3" max at 500 yards. Using Leupold VX3 in 3.5x10 and a VX3 in 4.5x14, the groups were the same as those using my Mk4. Frankly, i was unable to detect much if any parallax movement of the crosshair with the non adjustable scopes by moving my head around at that range. Using the Mark 4, unless I was at the extreme ends of adjustment, parallax determination was difficult to finely adjust and found that image focus was more of a dominant factor. I do make a strong effort to use a consistent cheek weld with my eye centered in the scope which will elimate parallax effects if they do exist. For mid range hunting. I actually prefer a non adjustable scope. One less thing to be concerned with. My favorite scope is a Nightforce 2.5x10. I'm not sure what's going on in the OP's case, but I would think that if proper shooting form is being used, accuracy degradation is likely coming from somewhere else. At magnifications of 15x and above parallax adjustment start to become a lot more critical. IMHO.
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  #11  
Old 09-11-2012, 08:56 AM
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Re: A parallax question for veteran shooters

The eye does not stay lined up with the scope tube, but with the erector.

In this boring 1 minute video of mine, you can see the image start to be occluded, from the point of view of a fixed camera position, when I crank on the turrets.


To get the camera to line up, I mounted it on a x-y rack and pinion from a scrapped out microscope.
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  #12  
Old 09-11-2012, 09:18 AM
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Re: A parallax question for veteran shooters

Quote:
Originally Posted by Clark View Post
The eye does not stay lined up with the scope tube, but with the erector.
OK, I'll put on my optical hat.

The erector tube's optical axis is rarely aligned with the scope tube's axis. As that tube is cocked at some angle off the scope's tube (and objective lens optical) axis so the desired aiming point in the target's image is centered on the reticule. Nothing behind the eyepiece ever gets aligned with it.

Fact is, the eyepiece optical axis is fixed in place on reticule centers when the reticule is between the eyepiece lens and erector/zoom lenses. Therefore, the aiming eye is in line with the eyepiece optical axis that also goes through the reticule center in such scopes. Otherwise, reticules so positioned at this place would never stay centered in the field of view.
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  #13  
Old 09-11-2012, 10:41 AM
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Re: A parallax question for veteran shooters

How I came up with the parallax errors to the .1 is I called Leupold and they have a parallax calicator & told me what it is. I was also concerned with Parallax error at long range & since I was haveing a windage dial Installed on my CDS 3.5x 10 40mm why not change parallax to 200 since the range I sight in at is 200 yds
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  #14  
Old 09-11-2012, 11:05 AM
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Re: A parallax question for veteran shooters

Quote:
Originally Posted by 1100 Remington Man View Post
I was also concerned with Parallax error at long range & since I was haveing a windage dial Installed on my CDS 3.5x 10 40mm why not change parallax to 200 since the range I sight in at is 200 yds
Nothing on that scope adjusts parallax. You adjust parallax by moving your aiming eye about the scope's exit pupil.

There is a side knob for setting the range it focuses at.
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