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#6933918 - 10/25/17 08:26 PM Interesting parallax observation, wearing corrective lenses (glasses)
Sigmund Offline
Light Foot

Registered: 12/15/15
Posts: 49
I had the rifle out a couple weeks ago, and found i was having a hard time getting the parallax adjusted just right. The target and reticle both appeared to be in focus, but if i would wiggle my head vertically, the crosshairs would stay on target. If i tried to do this horizontally, the crosshairs appeared to move. I've used this approach several times with a fully supported rifle (bipod and rear bag) as a sanity check for my parallax adjustment. So I'm quite confident i was not moving the rifle while wiggling my head around.

While doing some experiments, i tried moving my face closer to the scope, so that i could see the "tunnel" start to close like it does when you get too close to the scope. At this point i was expecting the tunnel to look like a circle, but instead it looked more like an approximately horizontal ellipse. Now starting to pay closer attention to what i was doing, i realized that i was looking through the top-left corner of my glasses. If i rotated my face to be more perpendicular to the scope, the tunnel changed from an ellipse to a circle, and the parallax appeared to be good in both windage and elevation.

The prescription for my glasses is kind of strong at -5.25. They aren't quite "Coke-bottle" lenses, but they do get a little thick around the edges. The scope on this rifle is also mounted a bit further forward than i would prefer, but i put it there so i could still operate the charging handle easily. I think this is how i got into a position where i was looking more through the corner of my glasses lens than the middle.

This phenomenon is something that i haven't noticed before, so I'm wondering if this is normal with corrective lenses? or is there something wrong with this scope? I was planning on trying the same experiment with some other rifles/scopes i have, but it will probably have to wait until this weekend. It's usually dark by the time i get home.

Does anyone else out there have experience with this?

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#6933939 - 10/25/17 08:36 PM Re: Interesting parallax observation, wearing corrective lenses (glasses) [Re: Sigmund]
FiremanJG Online   content
THF Celebrity

Registered: 12/16/08
Posts: 21806
Loc: Wolfe City, TX
My older customers frequently shoot without their glasses. They get the diopter correct, and adjust focus to their liking. Without their glasses they cannot read the turrets, so they put their glasses back on to read the turret designations. Then they remove their glasses to shoot again.

That's the best I can offer.
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#6934007 - 10/25/17 09:31 PM Re: Interesting parallax observation, wearing corrective lenses (glasses) [Re: Sigmund]
Walkabout Online   content
Bird Dog

Registered: 09/21/11
Posts: 377
Loc: Katy Texas
Yep it's like looking through two corrective lenses. They both cancel each other's performance.

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#6934247 - 10/26/17 07:19 AM Re: Interesting parallax observation, wearing corrective lenses (glasses) [Re: FiremanJG]
bar-d Offline
Tracker

Registered: 02/03/11
Posts: 971
Loc: The Lone Star State
Originally Posted By: FiremanJG
My older customers frequently shoot without their glasses. They get the diopter correct, and adjust focus to their liking. Without their glasses they cannot read the turrets, so they put their glasses back on to read the turret designations. Then they remove their glasses to shoot again.

That's the best I can offer.


This is what I have to do. Nearly wore out the earpieces on my bifocals yesterday sighting in three rifles.
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#6934299 - 10/26/17 08:15 AM Re: Interesting parallax observation, wearing corrective lenses (glasses) [Re: Sigmund]
dee Offline
THF Trophy Hunter

Registered: 04/10/10
Posts: 5062
Loc: Red River way
I take my glasses of while shooting. I've noticed a parallax issue on some things but a majority of the time image isn't as crisp as it is without. My turrets are fairly large so there's no issue there but I'm also near sighted.
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#6935364 - 10/26/17 09:31 PM Re: Interesting parallax observation, wearing corrective lenses (glasses) [Re: Sigmund]
Sigmund Offline
Light Foot

Registered: 12/15/15
Posts: 49
Thank you everyone for your feedback.

If my diopter werenít so far from normal, I think that would be an easy enough thing to do. But when I take my glasses off, itís pretty bad. Iím sure I could get used to this at the range, but when hunting I like being able to just look up and see more than just large patches of brown and green, and a blue spot where my feeder is. What Iím hearing here is that I either need to get lasik, or wear contact lenses when shooting with optics.

Iíve always felt I could shoot better, or it was easier to shoot better when I was wearing contacts, but I always assumed that was just in my head. Wouldnít have guessed that my glasses were actually playing havoc with the scope... Iím surprised that itís taken me this long to notice this issue.

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#6935496 - 10/27/17 05:20 AM Re: Interesting parallax observation, wearing corrective lenses (glasses) [Re: Sigmund]
FiremanJG Online   content
THF Celebrity

Registered: 12/16/08
Posts: 21806
Loc: Wolfe City, TX
I shoot with contact lenses. It was one of several reasons I went from glasses to contact lenses.
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