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Rear Ocular Focus

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/18/2010 at 10:09
jmmck View Drop Down
Optics GrassHopper
Optics GrassHopper


Joined: January/18/2010
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Hey guys,

I have a question on something I just recently noticed...all of my scopes over the years have been older model Leupold 3-9x40 scopes where the rear focus is done by turning the rear tube and then locking it down with the ring...I have recently acquired some new scopes where the rear focus is a small "rim" and you just turn it to focus the reticles (Simmosn, Explore, Nikon, etc.)...however, I notice that when you do this, there is nothing that "locks down" this point of focus...its like focusing a pair of binoculars...if you grab this ring with the rifle steady and move it up and down, the reticles move dramatically while looking thru the scope???...this appears to change the point of aim quite dramatically...maybe not enough to make a difference in a hunting situation, but I would think there would be a big change in target shooting...a friend called Simmons/Bushnell and they said the scope he had shouldn't be doing that...but we have looked at over a half dozen of our scopes of different manufacturers that all do this...I don't think all of our scopes can be defective!...has anyone noticed this?

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/18/2010 at 11:17
8shots View Drop Down
Optics Jedi Knight
Optics Jedi Knight
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Lord Of The Flies

Joined: March/14/2007
Location: South Africa
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Points: 5968
:
 
Are you sure you are not turning the zoom dial, in other words making your sight picture smaller or larger?
 
A lot of scopes do have quick focus, which is different. No, your point of aim should not change.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/18/2010 at 12:56
jmmck View Drop Down
Optics GrassHopper
Optics GrassHopper


Joined: January/18/2010
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no, I'm not referring to the zoom/power knob...this is the small ring on the very rear of the scope that allows you to change the focus of the reticles...when you turn it counter clockwise to focus the reticle, it backs out away from the rest of the scope...now, that piece has some "play" in it and it will move up and down slightly...when you move it while looking thru the scope, the crosshairs move!!...and I'm seeing  this on Simmons, Explore, and Nikon scopes...I can't believe this is purposely designed this way...I'm no shooting expert, but moving crosshairs can't be good!
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/19/2010 at 07:29
8shots View Drop Down
Optics Jedi Knight
Optics Jedi Knight
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Lord Of The Flies

Joined: March/14/2007
Location: South Africa
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Points: 5968
No the movement is not a good thing. This is maybe why some scopes cost more then others. We allways talk about glass, but not allways about overall construction.
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