Newbie needs help on AO

RMC51 · November 13, 2011, 03:10 PM

I have a Weaver scope K9-B. This thing has AO. What is AO? how does it work? how do I use it? The front dial has 50ft, 75ft, 100ft 50yd, 100yd, 200yd, 1000yd settings. What do these AO settings do? Is there a manual /book I can read about this AO thing.

Scope is 3x-9xAO mounted on a Winchester M70 pre 64 30-06. Is this a good match up?

wogpotter · November 13, 2011, 04:04 PM

"AO" means Adjustable Objective, it basically works like focusing a camera.
Do you need to focus your scope? Maybe, it depends.

Let me explain a little.....

Close shots (under 100yds) probably need the objective focusing, but if you're hunting how much time do you have at under 100yds? So, based on that if you either hunt beyond say 75 yds, don't target shoot under say 50 yds, & don't mind backing the magnification off a bit (focus gets less critical as you reduce magnification) you don't need an AO scope.

However....... if you want to target shoot with real accuracy (sub MOA talk here) the AO reduces/removes something called parallax. This is a good thing as long as you take the time to mess with the adjustment. Unfortunately the marks are at best, approximate. To really get best bang for the buck from an AO scope you need to trim (adjust) your particular scope. Does it work? yes. Do you have a use for it? I don't know, maybe you do. Can you just dial in a marked range & get some improvement, yup. Is more possible with a bit more work, again, yup!

g.willikers · November 15, 2011, 04:52 PM

With an adjustable objective scope, you only focus the eyepiece to make the crosshair clear for your vision.
The focusing for the target is done at the other end, with the AO.

November 13, 2011, 03:10 PM	#1
RMC51 Member Join Date: December 29, 2008 Location: Florida Keys Posts: 89	Newbie needs help on AO I have a Weaver scope K9-B. This thing has AO. What is AO? how does it work? how do I use it? The front dial has 50ft, 75ft, 100ft 50yd, 100yd, 200yd, 1000yd settings. What do these AO settings do? Is there a manual /book I can read about this AO thing. Scope is 3x-9xAO mounted on a Winchester M70 pre 64 30-06. Is this a good match up? __________________ RMC Florida Keys

November 13, 2011, 04:04 PM	#2
wogpotter Senior Member Join Date: September 27, 2004 Posts: 4,811	"AO" means Adjustable Objective, it basically works like focusing a camera. Do you need to focus your scope? Maybe, it depends. Let me explain a little..... Close shots (under 100yds) probably need the objective focusing, but if you're hunting how much time do you have at under 100yds? So, based on that if you either hunt beyond say 75 yds, don't target shoot under say 50 yds, & don't mind backing the magnification off a bit (focus gets less critical as you reduce magnification) you don't need an AO scope. However....... if you want to target shoot with real accuracy (sub MOA talk here) the AO reduces/removes something called parallax. This is a good thing as long as you take the time to mess with the adjustment. Unfortunately the marks are at best, approximate. To really get best bang for the buck from an AO scope you need to trim (adjust) your particular scope. Does it work? yes. Do you have a use for it? I don't know, maybe you do. Can you just dial in a marked range & get some improvement, yup. Is more possible with a bit more work, again, yup! __________________ Allan Quatermain: “Automatic rifles. Who in God's name has automatic rifles”? Elderly Hunter: “That's dashed unsporting. Probably Belgium.”

November 15, 2011, 04:52 PM	#3
g.willikers Senior Member Join Date: September 28, 2008 Posts: 10,442	With an adjustable objective scope, you only focus the eyepiece to make the crosshair clear for your vision. The focusing for the target is done at the other end, with the AO. __________________ Walt Kelly, alias Pogo, sez: “Don't take life so serious, son, it ain't nohow permanent.”