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Old 10th August 2016, 07:11 PM
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Default POI Shift?

I've heard some chat around the club that lets say you normally shoot at 20x and your clicks are set for this. Then if you zoom in to say 40x the poi could shift. I have a Falcon T50 which is Second Focal Plane, my question is does this make much of a difference if you are not so experienced?

Stu
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Old 10th August 2016, 07:20 PM
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your poi should not shift with t50
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Old 10th August 2016, 08:04 PM
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your poi should not shift with t50
I think it was a general statement and not about my scope. I was just wondering if any top shooters had ever noticed this.
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Old 10th August 2016, 08:20 PM
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One of my big nikko scopes changes poi when the magnification is changed. from the back of my mind I think it's about half of an inch windage 55 yards. been a while since I found this out. use it for fixed range shooting now,where it's no problem.
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Old 10th August 2016, 10:46 PM
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When you say your 'clicks are set for this', I take your dialling. If so, it's easy to check.
Set your mag to 20x, make a pellet mark at 55 yards. Mag up to 50x and aim at the same mark, if there's shift, expect to see a distinct right or left POI. Repeat to hearts content

If you hit the same mark it's fine

You might want to shoot from a bench just for the test.
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Old 11th August 2016, 12:11 PM
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Quote:
Originally Posted by Barry View Post
When you say your 'clicks are set for this', I take your dialling. If so, it's easy to check.
Set your mag to 20x, make a pellet mark at 55 yards. Mag up to 50x and aim at the same mark, if there's shift, expect to see a distinct right or left POI. Repeat to hearts content

If you hit the same mark it's fine

You might want to shoot from a bench just for the test.
Thanks Barry I'll give it a go with some sort of support as we don't have benches at the club and I'm not consistent enough doing it in seated position. So from your comment if there is a shift it may be left / right and not up / down?

Stu
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Old 11th August 2016, 03:50 PM
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Default t50

Quote:
Originally Posted by Bricktop View Post
Thanks Barry I'll give it a go with some sort of support as we don't have benches at the club and I'm not consistent enough doing it in seated position. So from your comment if there is a shift it may be left / right and not up / down?

Stu
I seem to remember that a t50 I had changed poi and would shoot a little left on 10 mag a fellow club memember also had the same issue, so we only used it on the mag we set it up on.
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Old 11th August 2016, 08:49 PM
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Quote:
Originally Posted by Bricktop View Post
Thanks Barry I'll give it a go with some sort of support as we don't have benches at the club and I'm not consistent enough doing it in seated position. So from your comment if there is a shift it may be left / right and not up / down?

Stu
Hi Stu.
There's a video online somewhere that I now can't find. It showed a reticle moving against a grid the scope was pointing at ( the 'grid' was actually a brick wall) as the mag ring was turned

It was a pronounced shift from centre to left but the shift was gradual as the mag ring was turned. I don't know if there are varieties of movement, it's all to do with scope internal mechanicals, tolerances and assembly quality. There's a lot of stuff going on in a small space in a high mag variable scope, most of which I have no clue about. I just know the problem can exist, in some scopes.

Give it a go, if yours does it, it's a relatively easy task to establish at what mag it happens, then don't mag above that.......or, don't change mag

I doubt it will though. Most are pretty good.

Here it is, it wasn't a brick wall, but a collimator grid https://drive.google.com/file/d/0B1w...w?pref=2&pli=1

And the link to the article. Now you know as much as me..... https://airgunaccuracy.wordpress.com...nikko-problem/
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Last edited by Barry; 11th August 2016 at 08:58 PM.
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Old 12th August 2016, 12:12 PM
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There's also a video with a brick wall. it was made by Jon H. The collimator grid video is about poi shift from the parallax wheel turning.
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Old 12th August 2016, 12:20 PM
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Quote:
Originally Posted by Barry View Post
Hi Stu.
There's a video online somewhere that I now can't find. It showed a reticle moving against a grid the scope was pointing at ( the 'grid' was actually a brick wall) as the mag ring was turned

It was a pronounced shift from centre to left but the shift was gradual as the mag ring was turned. I don't know if there are varieties of movement, it's all to do with scope internal mechanicals, tolerances and assembly quality. There's a lot of stuff going on in a small space in a high mag variable scope, most of which I have no clue about. I just know the problem can exist, in some scopes.

Give it a go, if yours does it, it's a relatively easy task to establish at what mag it happens, then don't mag above that.......or, don't change mag

I doubt it will though. Most are pretty good.

Here it is, it wasn't a brick wall, but a collimator grid https://drive.google.com/file/d/0B1w...w?pref=2&pli=1

And the link to the article. Now you know as much as me..... https://airgunaccuracy.wordpress.com...nikko-problem/
Hi Barry,

I appreciate you taking the time out to provide some great information for me to follow up on. I'll put my rifle on a gun rest and check it out. Many thanks. Stu
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