Why do cheap scopes lose their sighting when adjusting the magnification?
Firearm & Gun Forum - FireArmsTalk.com > Gear & Accessories > Optics & Mounts > Why do cheap scopes lose their sighting when adjusting the magnification?

Reply
 
LinkBack Thread Tools Display Modes
Old 06-23-2012, 01:31 AM   #1
Feedback Score: 0 reviews
 
Nomadjcb's Avatar
 
Join Date: Feb 2010
Location: Raleigh,North Carolina
Posts: 10
Default Why do cheap scopes lose their sighting when adjusting the magnification?

Why do cheap scopes lose their sighting when adjusting the magnification?

Does it cause them to pull one way or is it completely unpredictable?

If returned to the orginal position will they still be sighted?

I am on a very tight budget. How can one tell before buying how much of a problem this is?

__________________
Nomadjcb is offline  
 
Reply With Quote

Join FirearmsTalk.com Today - It's Free!

Are you a firearms enthusiast? Then we hope you will join the community. You will gain access to post, create threads, private message, upload images, join groups and more.

Firearms Talk is owned and operated by fellow firearms enthusiasts. We strive to offer a non-commercial community to learn and share information.

Join FirearmsTalk.com Today! - Click Here


Old 06-23-2012, 01:44 AM   #2
FTF_SUPPORTER.png
Feedback Score: 0 reviews
 
Join Date: May 2012
Posts: 253
Liked 80 Times on 53 Posts
Likes Given: 15

Default

Try focusing at the highest power, then backing it down. If it stays in focus, then it's good ("parfocal") ... it it falls out of focus (from high mag to low mag), it's poorly designed or defective.

__________________
scottmac is offline  
 
Reply With Quote
Old 06-23-2012, 01:46 AM   #3
Feedback Score: 0 reviews
 
Join Date: Nov 2011
Posts: 2,193
Liked 121 Times on 86 Posts

Default

Quote:
Originally Posted by Nomadjcb
Why do cheap scopes lose their sighting when adjusting the magnification?

Does it cause them to pull one way or is it completely unpredictable?

If returned to the orginal position will they still be sighted?

I am on a very tight budget. How can one tell before buying how much of a problem this is?
The internals on cheap optics are very lackin to say the least, single erector systems are common so when u turn the power up the poi changes, but just becouse tight budget dosent mean you cant get lower cost good optics like a sightron, or vortex, nikon pro staff, bushnell, you can find good deals on not so junk scopes
__________________
Muliemaster is offline  
 
Reply With Quote
Old 06-23-2012, 01:49 AM   #4
Feedback Score: 0 reviews
 
Nomadjcb's Avatar
 
Join Date: Feb 2010
Location: Raleigh,North Carolina
Posts: 10
Default I think I got my answer.

This is called shifting zero.

I think I just got my answer from a post by M14sRock.

__________________

All who wander are not lost and many who travel a
straight path do not know where they are going.

The Light shines into the darkness and the darkness has not overcome it.

Nomadjcb is offline  
 
Reply With Quote
Old 06-23-2012, 01:59 AM   #5
Feedback Score: 0 reviews
 
Join Date: Jan 2012
Posts: 804
Liked 26 Times on 22 Posts
Likes Given: 67

Default

I have changed the scopes on all my guns to CenterPoint 4-16x40mm, and just love them. Many, if not all, cheap scopes have plastic gears that strip out easily if not extremely careful.

Also, many cheap scopes can't handle the high recoil on high-powered rifles. It has the tendency to jar the reticles off center during the shot and shift the reticle tube against the spring.

__________________
Ranger-6 is offline  
 
Reply With Quote
Old 06-23-2012, 03:13 AM   #6
Feedback Score: 0 reviews
 
Jpyle's Avatar
 
Join Date: Aug 2009
Location: Sewell,NJ
Posts: 4,832
Liked 776 Times on 449 Posts
Likes Given: 492

Default

99.999999% of the cost of a high-end scope is attributable to the quality of the optics and the precise methods used to grind, curve and polish the lenses. Can you guess where the cost cutting gets done in a low priced scope? The mass produced optics in a cheaper scope simply lack the precision needed to properly collect and focus the light. Aberrations on cheap optics are not unlike a human suffering from an astigmatism.

__________________

"The whole of the Bill (of Rights) is a declaration of the right of the people at large or considered as individuals.... It establishes some rights of the individual as unalienable and which consequently, no majority has a right to deprive them of." (Albert Gallatin of the New York Historical Society, October 7, 1789)

"A free people ought not only to be armed and disciplined, but they should have sufficient arms and ammunition to maintain a status of independence from any who might attempt to abuse them, which would include their own government." - George Washington

Jpyle is offline  
 
Reply With Quote
Old 06-23-2012, 05:57 PM   #7
FTF_SUPPORTER.png
Feedback Score: 0 reviews
 
locutus's Avatar
 
Join Date: Dec 2011
Location: Wyoming
Posts: 9,943
Liked 6344 Times on 3547 Posts
Likes Given: 5923

Default

Because cheap scopes are junk??

__________________
“We sleep safely at night because rough men stand ready to visit violence on those who would harm us.”
Winston Churchill



War is the continuation of politics by other means.
Carl von Clausewitz
locutus is offline  
 
Reply With Quote
Old 06-23-2012, 06:12 PM   #8
Feedback Score: 0 reviews
 
Trez's Avatar
 
Join Date: Jan 2011
Location: 3-P
Posts: 3,736
Liked 795 Times on 519 Posts
Likes Given: 898

Default

Quote:
Originally Posted by Ranger-6 View Post
I have changed the scopes on all my guns to CenterPoint 4-16x40mm, and just love them. Many, if not all, cheap scopes have plastic gears that strip out easily if not extremely careful.

Also, many cheap scopes can't handle the high recoil on high-powered rifles. It has the tendency to jar the reticles off center during the shot and shift the reticle tube against the spring.
I like the centerpoints too.. I have one on my Weatherby .22 and its awesome! (And cheap, got it at walmart)
__________________
Quote:
...... I suffer from a very rare genetic defect that causes me to be sympathetic toward the International cause. There is no cure.
Trez is online now  
 
Reply With Quote
Old 06-23-2012, 07:07 PM   #9
Feedback Score: 0 reviews
 
Join Date: Nov 2011
Posts: 2,193
Liked 121 Times on 86 Posts

Default

Quote:
Originally Posted by Trez

I like the centerpoints too.. I have one on my Weatherby .22 and its awesome! (And cheap, got it at walmart)
I dont get it, they are durable lookin yes, but the optics are in no way clear, people do say they seem to hold zero but are fuzzy or hazy in the higher powers, so whats good about a scope that isnt clear ???I just dont get it . And yes i have looked through one, had one on a 22 mag for about an hour. The scope sucked very unclear. So maby my eyes are gettin bad but im just not so sure
__________________
Muliemaster is offline  
 
Reply With Quote
Old 06-23-2012, 07:12 PM   #10
Feedback Score: 0 reviews
 
Join Date: Sep 2011
Location: fordland,missouri
Posts: 11,099
Liked 862 Times on 648 Posts
Likes Given: 1

Default

Quote:
Originally Posted by Muliemaster

I dont get it, they are durable lookin yes, but the optics are in no way clear, people do say they seem to hold zero but are fuzzy or hazy in the higher powers, so whats good about a scope that isnt clear ???I just dont get it . And yes i have looked through one, had one on a 22 mag for about an hour. The scope sucked very unclear. So maby my eyes are gettin bad but im just not so sure
The only one I have anymore is the 3-9x32. I have one on my ruger 10/22 tactical hunter and one on my Marlin 882 SS 22 mag. They are a good scope. Its awesomely clear. Then again its not real high magnification
__________________
Marlinman is offline  
 
Reply With Quote
Reply

Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Firearms Forum Replies Last Post
Red dot magnification GREGULON Optics & Mounts 3 03-26-2012 03:47 AM
Cheap Scopes & Red Dots Mysterion Optics & Mounts 19 08-16-2011 03:33 AM
Cheap Scopes mrb1982 Optics & Mounts 14 05-17-2011 03:22 PM
cheap sighting systems... janikphoto Optics & Mounts 10 11-18-2008 02:34 AM
Scopes and sighting a rifle painted_klown .22 Rifle/Rimfire Discussion 13 05-21-2008 10:03 PM