Author Topic: stupid question on adjustable objectives? (Read 397 times)

thelaw · « **on:** July 27, 2004, 03:39:08 PM »

i know its a stupid question, but in all my years of hunting i've never owned nor known many people that had scopes with adjustable objectives. what are their purpose for example on the bushnell elite 4200 series? i've been told they are for range estimation and i've been told they are for focusing in on distant targets. please help.

Zachary · « **Reply #1 on:** July 27, 2004, 04:23:02 PM »

Range estimation?...no.
Focusing?....no.

AOs are to correct paralax. I can understand why people would think that they are for focusing, because it appears that way when you adjust the AO, but it's really for correcting paralax. AO's still have a focus knob.

Zachary

7magWoodsman · « **Reply #2 on:** July 27, 2004, 04:26:30 PM »

There is no such thing as a stupid question. I have never and will never own one but I know a lot of people that do. Unless I am wrong it adjusts the paralax for a given distance and depending on the quality gives a better resolution for the distance stated on the AO. Please someone let me know if I am wrong.
To me it just gives me something else to worry about other than the target. My :money:

Graybeard · « **Reply #3 on:** July 27, 2004, 04:40:45 PM »

As Zach said the AO feature is to correct for parallax at any one specific distance. In theory at least you should be able to reduce parallax to effectively zero thru the use of the AO feature. In practice you never quite get there. The numbers are seldom right and how close to no parallax you get depends on how well your eyes can tell you when there is none.

It is really needed only at about 10X and above on rifle scopes and above about 7X on handgun scopes. Below those numbers it really just isn't needed. That's not to say there is no parallax as there is ALWAYS parallax at all but ONE distance, that being whatever distance the scope is set parallax freee by the factory or by you using the AO feature.

Parallax is the apparent movement between your target and the cross hairs. Fix the rifle firmly and look thru the scope. Move your head up and down and side to side and if you see any shift of the cross hairs to target that is parallax.

GB