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Is this normal, or is this scope broken? |
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slowr1der
Optics Apprentice Joined: March/25/2010 Status: Offline Points: 247 |
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Posted: September/25/2010 at 00:13 |
So I have a Nikon 3-9x40 Prostaff. I picked it up online for a heck of a deal. It would normally not be my first choice, or my second, or anywhere even close to my top choices, but I got such a good deal I couldn't pass it up. I figured I could try it out, see how I liked it, then sell it for a profit if I didn't like it as I expected. I decided once getting it, that it would be better than the Simmons I was temporary using until the SS 5-20 variable power comes out, so I decided to mount it to my rifle. Anyway, after I mounted it, I went to adjust the focus. This is where I noticed something odd. Once the focus knob was loosened it would wobble a little bit in your hand. Not a ton, but a little bit. I noticed as you moved it around slightly, the cross hairs would move around inside the scope too. Is this normal? Or is something wrong here? Does this mean every time I adjust the focus it's going to change zero? Once the focus knob is tightened down with the lock ring the cross hairs don't move.
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Magnumdood
Optics Apprentice Joined: January/17/2009 Location: Illinois Status: Offline Points: 226 |
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The reticle should never move unless you manipulate the elevation or windage turrets. I hate to say it, but it appears you found the reason you got such a good deal. Additionally, the focus ring should only turn on the threads, not wobble. Edited by Magnumdood - September/25/2010 at 02:06 |
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slowr1der
Optics Apprentice Joined: March/25/2010 Status: Offline Points: 247 |
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slowr1der
Optics Apprentice Joined: March/25/2010 Status: Offline Points: 247 |
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After looking at it more, I think it might not be the crosshairs
moving, but instead the rear lens moving and making it appear as though
the crosshairs move up and down as you move the lens. I'm not sure, but
I know that every other scope I have with an adjustable eyepiece to
adjust the focus is doing this, so I figure it really can't be a bad
scope.
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Magnumdood
Optics Apprentice Joined: January/17/2009 Location: Illinois Status: Offline Points: 226 |
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Good news then!
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sakomato
Optics Master Joined: February/28/2008 Location: Houston Status: Offline Points: 1166 |
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The lock ring will square up and keep the ocular from moving after adjusted. You should only adjust the ocular once, to make the reticle sharp and clear. You should not have to move the ocular reticle adjustment again, ever.
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Guns only have 2 enemies, rust and politicians
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slowr1der
Optics Apprentice Joined: March/25/2010 Status: Offline Points: 247 |
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So since all my other scopes do it too is it safe to assume this is normal?
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Magnumdood
Optics Apprentice Joined: January/17/2009 Location: Illinois Status: Offline Points: 226 |
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If you're really concerned, send it in to Nikon and ask them to look it over.
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magshooter1
Optics Professional Joined: August/27/2008 Location: El Dorado, AR Status: Offline Points: 827 |
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Have seen the same thing happen with some of mine and never had a problem out of them. Once tightened down everything was fine.
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Some people are educated BEYOND their intelligence.
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tman1965
Optics Master Joined: July/20/2010 Location: South Georgia Status: Offline Points: 1456 |
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Sometimes my tongue outruns my brain and I say something I haven't thought of yet!
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biggreen747
Optics Journeyman Joined: October/16/2009 Location: Colorado Status: Offline Points: 470 |
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Or untill your vision changes. Unfortunately that happens to most of us eventually.
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We measure it with a micrometer, mark it with a crayon, and cut it with a chainsaw.
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slowr1der
Optics Apprentice Joined: March/25/2010 Status: Offline Points: 247 |
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Well, I shot it today and it shot great. Same POI at all different magnifications I tried, and it stayed zeroed.
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