POI change with zoom

Braces Airgun Masters
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cooperjb1308

Well-Known Member
Just wondering whether anyone can shed some light on my situation, I've recently zeroed my tikka t3 25-06, unfortunately the scope I wanted to mount on it has come down with a case of broken reticle so off to meopta it is.
In the meantime I have mounted a hawke vantage 6-24x50 and the duo were printing moa or slightly smaller groups at 24x but when I dropped it back to 10x the POI moved 2 inches up and left.
This has not been a problem on my other hawke scope that was on my 243 when I moved between 4 and 12x zoom so my question is is it worth mentioning to hawke or slthe shop I bought it from or is it common in relatively cheap scopes.
 
That is deffo a problem. I am pretty sure that Hawke have a lifetime warranty to the original purchaser.
 
my mate had similar happen on a hawke scope cant remember what model, we were out one evening his gun was shooting 2" low but straight, moved it up 8 clicks but was shooting 1.1/2" left 6 clicks right spot on now my hawke is ok???
 
Mounts are all tight rechecked them Nd it would hold zero on any other zoom but didn't like doing between 24 and 12 which ki d of defeats the purpose of having a 24 power scope. I'll see if I can't get hawke on the case
 
Optics is an amazing subject. If the lenses are not ground properly or aligned properly upon changing zoom the poi will shift because of the optical distortion.

When the zoom ring is turned it pushes the lenses closer together or further apart to bring the object closer or further away, ie altering the focal length.

Has the scope been dropped at any point to throw the lenses Inside out of alignment. That would make sense if you zero it on one magnification and then change it.
 
Rider said:
This is a technical problem of all scopes with the reticle in the second focal plane. Some show it more evidently than others. Most users don't even realize it is there.
Click to expand...
i agree with you fully. i was on an american forum and shooters were questioning a night force scope altering levitation when changing windage when scoping in, and ive had the same problem on some scopes,now when i zero i dont alter a thing when out foxing and always check my zero before i start but still miss now and again, i put it down to the ground, some soft some firm or maybe looking across the scope as you cant square it in the dark like in the daylight all in a nights shooting
 
Rider said:
This is a technical problem of all scopes with the reticle in the second focal plane. Some show it more evidently than others. Most users don't even realize it is there.
Click to expand...
This was a well known problem with 2nd FP scopes when I started stalking in the early eighties and one of the reasons many of us older guys stuck with our European fixed powers for so long,
 
Namman said:
This was a well known problem with 2nd FP scopes when I started stalking in the early eighties and one of the reasons many of us older guys stuck with our European fixed powers for so long,
Click to expand...
At that time you might just as well have opted for a variable with FFP, which was the European norm until about 15 - 20 years back. With FFP scopes a potentially shifting POI on altering the magnification doesn’t exist.
 
Last edited:
I have a Hawke Vantage on my .17hmr. If the same as yours, it is an SFP with the focus ring at the front. I am aware that if I change zoom, I must also re-focus to avoid any error from parallax.

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Rider said:
At that time you might just as well have opted for a variable with FFP, which was the European norm until about 15 - 20 years back. With FFP scopes a potentially shifting POI on altering the magnification doesn’t exist.
Click to expand...
Agree, but some didn't like the increase in size of the reticule when zooming. I believe that 6x 42 's were the most popular scopes in the UK, by quite a margin in the good old days.
Also there was the added cost of a variable!
 
POI shift with magnification change in SFP scopes may gave been a problem in the early days of variable magnification scopes when the mechanics of moving the 2 lenses needed for variable magnification had not been refined as well as it is today,
There are very few modern variable magnification scopes that suffer from POI shift with magnification change.

Cheers

Bruce
 
cooperjb1308 said:
Just wondering whether anyone can shed some light on my situation, I've recently zeroed my tikka t3 25-06, unfortunately the scope I wanted to mount on it has come down with a case of broken reticle so off to meopta it is.
In the meantime I have mounted a hawke vantage 6-24x50 and the duo were printing moa or slightly smaller groups at 24x but when I dropped it back to 10x the POI moved 2 inches up and left.
This has not been a problem on my other hawke scope that was on my 243 when I moved between 4 and 12x zoom so my question is is it worth mentioning to hawke or slthe shop I bought it from or is it common in relatively cheap scopes.
Click to expand...
Times like this you wished you went down the vortex route!
 
Namman said:
Agree, but some didn't like the increase in size of the reticule when zooming. I believe that 6x 42 's were the most popular scopes in the UK, by quite a margin in the good old days.
Also there was the added cost of a variable!
Click to expand...
Hmm, thinking back I believe I also had a fixed 8x56 at the time :tiphat:.
 
Also my Hawke Sidewinder 6,5/20 Tact problem on POI with change of magnification and regualation of sidewinder, the factory not answer on my warranty
 
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