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How does a scope get "knocked" off ??

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/26/2011 at 08:44
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Optics Journeyman
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I let my Dad borrow my muzzleloader and he dropped it and knocked it off a few inches at 50 yrds. It got me wondering after all these years and re-sighting.............I don't really understand how a scope works. I have an opinion on how they perform in low light but have no clue about them mechanically.
 
So if you bump or drop a scope ...........how does the reticle get moved ? If the turret has not moved why do you now have to make more clicks to get it back to the same point of impact ? Is it like jumping teeth on a gear or what ?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/26/2011 at 09:37
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  VERY basically. When a scope gets "knocked" the way it's not suppose to be,the erector assembly can move slightly.  Take a look at this.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/26/2011 at 12:12
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Or, it can also be the mounts that shifted due to impact.  It doesn't take very much mount movement to significantly shift the scope's POA.  This is why solid mounts are important.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/26/2011 at 13:13
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Also, especially if a blow is taken by the objective, you don't need to bend the tube a noticeable amount to cause problems.  If you just "tweak" it such that the objective is a few thousandths out of the alignment it was in before, your POI will change.  
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