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An observation about the SF on the 4200

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/30/2007 at 23:35
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I finally got to check out my 1" tubed Bushnell side focus 4200 scope at the 300 and 400 yard firing ranges today.

 

What I was concerned with, was though the scope's side focus knob had 300, 400, and 500 yard markings on it, I had to set the knob at it's maximum infinity setting at the 300 yard target.

 

Though the clarity of the targets viewed at 300 or 400 yards seemed sharp enough, I was a little concerned that I was already at the maximum setting at 300 yards, and not at the 500 yards like the knob was indicating it supposed to be. What I'm wondering is....if I had a little more adjustment with the knob, would I actually be able to maybe sharpen the image even more at 300- 400 yards?....or should I just consider the "500" marking on the knob nothing more then an error, and consider the scope's true infinity distance being wherever it's going to be. (which happans to be at about 300 yards) 

 

Have any of you guys experienced this with your new Side Focus Elite Scopes?  



Edited by Centerfire
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/01/2007 at 08:26
Mike McDonald View Drop Down
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You may want to go through the new scope set up routine, assuming you have not already.

1st, disregard any and  all range number markings on the parallax dial, it's pure marketing hyperbole.

2nd, pointing the unloaded rifle at a clear sky or  other featureless background, use the ocular adjustment to bring the
reticle into precise focus.

Do this by making gross adjustments until the reticle seems very well defined.

Get off the rifle and look at other things for a few seconds.

Get back on the rifle at take a snapshot look at the reticle.  No more than 2 seconds.  How does it look?
Probably not as well as you thought  a few seconds ago.

Look away for several seconds then go back to the reticle and sharpen with the ocular.

Look at the cross hair intersection, and the intersection between fine and coarse reticle sections.

Continue this procedure until the reticle is sharp at all points.  It should take less than a minute to do this.

Now try the parallax adjustment.  You should find that it operates as designed once the reticle is focused properly.


Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/01/2007 at 22:44
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Mike am I missing something here?

 

I have been using the scope just fine at the 100 yard range for the last few visits to the firing rane. The accuracy and 5 shot groups at 100 yards with my AR15 using this scope have been 5/8" to 3/4"groups. Yes, I can adjust the SF knob back and forth a 1/16 of a rotation to the point that I can read the 1/4" tall numbers on the target. And no, I don't care if the markings on the SF knob are not calibrated to the true distance of the target. As you suggested not to use the SF knob as a range finder.....I don't and never have.

 

My question is: Why am I at the maximum infinity marking when I shoot at 300 yards, when the knob has infinity after 500 yards?  There is no further adjustment on the SF knob when I'm at 300 yards. It's already turned up as far as I it can go. If I turn the SF knob the other way, then the image instanly gets blurry.

 

Maybe a clearer question to ask: SHOULD THIS SCOPE BE RUNNING OUT OF SIDE FOCUS KNOB ASDJUSTMENT AND BE AT THE MAXIMUM INFINITY SETTING AT THE 300 YARD TARGET?

 

      

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/02/2007 at 08:39
Mike McDonald View Drop Down
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Well, starting from the bottom;

I've experienced scopes that would not focus past a certain distance regardless of  methodology employed.

What I was attempting to convey is, should you not take the time to properly focus the reticle to it's clearest resolution,
the parallax adjustment in some scopes will not allow proper focus at distance.  I have not specific experience with the 4200 series optic.
I've experienced this in a  couple different brand units.

SO, if you've taken time  to do the reticle focus check using the ocular, and the target will still not focus, then either you've reached the end of the focal limit for that scope, OR the factory installed the parallax adjustment knob out of position and you might try silpping the knob rearward in it's rotation to see if there is a gain in available adjustment before the knob hits it's upward limiit.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/02/2007 at 22:54
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Thanks for the input. I'll double check the reticle adjustment.

 

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/04/2007 at 05:35
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There is a lot of talk about backlash in the sidefocus scopes and the fact that you need to return to infinity whenever desiring to decrease distance to maintain accuracy. The scope makers don't mention this at all concerning the sidefocus scopes but the fact remains that if there is any movement because of the side focus design that it would affect it. I believe that the ocular focus has to be in the proper adjustment range to allow the AO to function even remotely close to the dial. Since you are using focus to identify the correct AO distance you are no doubt correct on your settings.

     focus


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