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focal planes

 
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  #8  
Old 08-12-2011, 01:16 PM
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Join Date: Feb 2011
Posts: 11
Re: focal planes

Thanks, My initial intentions were to get a VX III with drop turrets and a nikon range finder. I see Zeiss has a rebate programon turrets thru end of year so I might do a conquest and save a couple months for the range finder. I have heard alot if good about the conquest line of scopes but do not have any experience with them. I have only had good experiences with lisping and will probably stay with them. Thanks again for all he info.
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  #9  
Old 08-12-2011, 03:38 PM
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Re: focal planes

I'm a leupold whore myself but tell us your budget and we can help.
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  #10  
Old 08-12-2011, 05:18 PM
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Join Date: Feb 2011
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Re: focal planes

I have $900 now but also want to get new rings. I have savage original equip rings now.
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  #11  
Old 08-12-2011, 07:30 PM
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Join Date: Jul 2011
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Re: focal planes

To your original question:
Thee are 2 different images in your scope. The image of the target, which is focused by the side focus (move the image focal plane forward and backwards, with the idea that it is focused sharply on your retina). The second is the image of the reticle. If the reticle image plane and the target image plane do not coincide, then the point of impact will shift if you move your eye off the exact optical centerline of the scope.

To avoid this state of affairs, the recommendation is to point the scope at a featureless surface (plain untextured wall or open sky with no clouds). Then position yourself behind the scope, close the eye, and open it briefly to see if the reticle is in sharp focus. Adjust the eyepiece focus in or out to get the reticle to look as sharp as possible when viewed briefly (if you stare at it, you eye will try to correct for out of focus and fool the brain). When you get it as good as possible, then point at a high contract target and adjust the side focus until the target is sharp. Probably want to do the same routine (look briefly through the scope, then close the eye, repeat) since if you stare at the target the brain will try to correct.

When the target appears to be in focus (without having adjusted the eyepiece, only the side focus), now align the rifle carefully with a spot on the target and fix the rifle position (gun vice or whatever means you have). Now without touching the rifle or changing the point of aim, move your eye away from the center of the scope and see if the position of the cross hairs moves off the point of aim. Move the eye left, right up / down to see that it stays aligned with the point of aim. If it stays aligned, then all is well for that target distance. Now the procedure has to be repeated at other distances. Obviously at long range it make a bigger difference, but the good thing is that as one approaches infinity the degree of focal shift becomes smaller and smaller on the side focus, whereas a relatively large correction is needed for intermediate distances (100-500yds).

One of the things to check is whether the scale on the side focus matches in any way the actual distance to the target. Len says that it generally does not, even on high $ scopes. That means one needs a kind of "cheat sheet" for the scale on the side focus wheel, because in the field one seldom has a high contrast target, so after rangeing one needs to simply rotate the side focus to match the range as quick as possible.
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  #12  
Old 08-12-2011, 09:04 PM
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Join Date: Sep 2010
Location: Outback, Australia
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Re: focal planes

Quote:
Originally Posted by Richwv View Post
I had just read many places the point of impact also changes and that did not make sense to me.
It has been explained to me that early variable scopes used a 'worm gear' to shift magnification which ment the reticle moved in a corkscrew fashion as power went up or down. I don't know how it is done now.

I believe even today German Zeiss scopes can only guarantee a max of 1/2" (The best in the industry) change of POI at 100 yards between max and minimum magnifications with their 2nd focal plane scopes.

This is all 3rd hand.

Last edited by Code4; 08-12-2011 at 09:10 PM.
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  #13  
Old 08-13-2011, 07:40 AM
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Re: focal planes

Quote:
Originally Posted by Code4 View Post
I believe even today German Zeiss scopes can only guarantee a max of 1/2" (The best in the industry) change of POI at 100 yards between max and minimum magnifications with their 2nd focal plane scopes
I don't believe this.
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  #14  
Old 09-04-2011, 05:07 AM
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Join Date: Sep 2010
Location: Outback, Australia
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Re: focal planes

If you can post a written guarantee from a Manufacturer please do.
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