Opticaly centering.

A place to share your tips and tricks for modifying your FX Airgun.

Opticaly centering.

Postby FXpoacher on Tue Aug 05, 2008 10:16 pm

Had my T12 apart to remove 6( :o ) pellets from the barrel that my brother had cleverly loaded at once!! :twisted:
When i refitted the scope after, the zero was way off.
So i bit the bullet and decided to opticaly center the scope.
Refitted it and it was about 10cms to the right at just 10mtrs!
So i made shims from a beer can to put between the mount and block.
Anyway to cut a long story short, with a shim under the the back of the scope as well, i now have zero without making any adjustment to the windage screws at all, leaving all that play to.....errr.....play with if i need it! :D
Takes a fair bit of time, but with the storm we had yesterday, i could'nt go out anyway!
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Re: Opticaly centering.

Postby ian johnstone on Tue Aug 05, 2008 11:05 pm

Richard, I know where you've been with this one (damn annoying) but what's done, is done :|
I've read & tried the full & proper technique (a complete PITA) & now just do the Click Centring method. (before mounting the scope, count the clicks 'stop to stop' for each turret then divide by 2) - then try to ensure all your mount systems keep those settings as near to 'Centre' as possible for your POI. I've never 'got on' with adjustable mounts though :o
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Re: Opticaly centering.

Postby FXpoacher on Wed Aug 06, 2008 8:52 am

Richard, I know where you've been with this one (damn annoying) but what's done, is done :?
Who's richard?

Anyway i made a stand out of 2 bit's 6x150x80mm plywood and and a 100x100x150mm lump of pine.
I put the 2 plywood bits on top of each other and on the short end cut out a "V".
These i fixed too each end of the pine lump.

The scope was rested in the "V's" and turned round while looking through the scope at a point 10mtrs away.
The windage screws were adjusted untill i could turn the scope and the cross hair center stayed on the point i was focused on.

The screwing in and out way i had tryed before, and i put a mark ont the threads so i knew what was center.
Thing is, now i know it is centered and the original marks are way off! :shock:
Mayby i never did it right the first time, but now i'm a lot hapier as i know for sure now that it is dead center now.
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Re: Opticaly centering.

Postby ian johnstone on Wed Aug 06, 2008 1:37 pm

Whoops - I was also answering a thread on another forum FXPoacher :D .

That was the way I was told to optically centre a scope but I found that method highly tedious :o .
I've a Falcon scope that has so much Windage adjustment that you can see the edge of the lens on its furthest clicks (spoke to Falcon about it & they said it was a deliberate design decision). Apart from not wanting to be looking through the edges of the adjustable lenses I'm told that the Turrets/Click Adjusters themselves are at their most accurate & least 'stressed' when centred. Ideally one keeps the scope at its optical centre & either shim to POI or buy some adjustable mounts - again I take the quick fix solution (& shim mostly) then I use a proper Boresighter on a regular basis.
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Re: Opticaly centering.

Postby FXpoacher on Wed Aug 06, 2008 2:11 pm

Are those bore sighters worth the money?.
Looks the bees knees, but they only work out to the point before the pellet starts to drop dont they?
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Re: Opticaly centering.

Postby ian johnstone on Wed Aug 06, 2008 6:14 pm

Well I paid £35 for my s/hand one (the first one) & also bought a BSA set (Winter Sale Bonanza :D ).
I'm talking about the old fashioned Collimator (not Laser) and they usually come with inserts for calibres .17 (not actually.177) upwards to 30-06.

What you actually see is a very fine grid of 200 squares plus a standard crosshair which is generally meant to represent POI at 100yards (22LR) but that doesn't actually matter because each Gun/Scope will show a subtle diff. (On most of my scopes 4 clicks are required to traverse each square). I just approx the scope using the Boresighter (usually just 3.5 squares down) then fine tune on targets, after a day or two of feeling 'happy/confident' with the Zeroing I use the Boresighter again this time making a note of the exact position (for that combo). After that I recheck (at home, in the kitchen) on a monthly basis - all this because I once owned a Hawke Scope :o (might have been a one-off). If you've ever owned a scope that loses Zero, you'll never be really confident again !
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Re: Opticaly centering.

Postby gunvider on Fri Dec 12, 2008 9:44 am

FX2000 .177 FAC
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Re: Opticaly centering.

Postby TitaniumRx on Mon May 09, 2011 5:21 pm

I try this method and its work just fine and quick.Very simple. http://www.youtube.com/watch?v=-A3GwfB0 ... re=related
For practical reasons you can use a little mirror without unmount your scope.
Thinks you must dont forget : Set the power of scope to its minimum scale and the parralax to infinity.Best results is with a lot of light upon the scope.
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