Parallax Adjustment

[majohnson]

A friend I shoot with is being told by a scope manufacturer, that any change of adjustment with the elevation turret requires that the parallax be readjusted. Even though there is no change in the shooting distance.

I read several articles and can not find anything that reiterates what he is being told by the manufacturer.

 

[Puzzaz01]

I've never heard of such! But I'm interested in seeing what some Of the other people have to say. If your parallax is set to a specific distance and that specific distance isn't changed then how can a click of height adj change anything? Just don't see it!!!

 

[LHSmith]

Parallax may change, although subtle, as atmospheric conditions change while shooting at the same distance. If you're shooting a match, it is best to check for it at the start of each match relay.An elevation adjustment causing a parallax change makes no sense to me.....if that was the case a windage adjustment would be no different as parallax occurs in both x and y axis.

 

[XBBR Shooter]

A friend I shoot with is being told by a scope manufacturer, that any change of adjustment with the elevation turret requires that the parallax be readjusted. Even though there is no change in the shooting distance.

I read several articles and can not find anything that reiterates what he is being told by the manufacturer.

Pure meadow muffins...

 

[majohnson]

Thanks everyone. I just don't see the logic behind what he is being told.

 

[Turbulent Turtle]

A friend I shoot with is being told by a scope manufacturer, that any change of adjustment with the elevation turret requires that the parallax be readjusted. Even though there is no change in the shooting distance.

I read several articles and can not find anything that reiterates what he is being told by the manufacturer.

I would not dismiss this out of hand. Is it possible to know a few things first: 1- Scope manufacturer, 2- Scope model, 3-Is this a side-focus or an AO scope?

If it's a side-focus, I can see where this might be possible.

 

[majohnson]

It is a side adjustment version.

 

[Ggmac]

I end up adjusting parallax a few times a day , temp , humidity changes , eyes getting tired , etc . I never thought of elevation , but it makes sense . Your going from say 100 to 300 or 600 , your no longer looking thru the same spot on the lenses , the further you go from center , the sweet spot ,or the dif length from one lense to the other in the erector tube , the diff length of diffused light waves . I don't know if that came out correct but I hope it can be understood .

 

[taliv]

should be easy to test, but i'll bet money it has no effect on quality scopes

 

[DennisH]

Many YouTube videos and Google articles on the subject.

Check the following out, they helped me a few years ago, then I asked questions. Hopefully one of the articles below will get you a little inforation on the subject.

Dennis

http://get.smarter.com/qa/technolog...3a9bd98b8c4?ad=semD&an=msn_s&am=broad&o=32264

http://blog.cheaperthandirt.com/understanding-and-correcting-parallax/

http://www.accurateshooter.com/optics/parallax-in-rifle-scopes/http://www.accurateshooter.com/optics/parallax-in-rifle-scopes/

 

[majohnson]

It a $2K scope so not necessary the lower end. This is without changing shooting location, this is over less then a dozen rounds.

 

[Dan Boone]

This was discussed a few days ago. Here is the BEST article that has ever been written on the subject. It is concise, correct, and explains the situation in depth..........................

http://www.snipercountry.com/Articles/Parallax.asp

 

[Puzzaz01]

Dan Boone ..... Thumbs up! Everyone needs to read this.

 

[Ggmac]

Good article , thanks !

 

[LHSmith]

This was discussed a few days ago. Here is the BEST article that has ever been written on the subject. It is concise, correct, and explains the situation in depth..........................

http://www.snipercountry.com/Articles/Parallax.asp

How does this ^^^ answer this:

A friend I shoot with is being told by a scope manufacturer, that any change of adjustment with the elevation turret requires that the parallax be readjusted. Even though there is no change in the shooting distance.

I read several articles and can not find anything that reiterates what he is being told by the manufacturer.

 

[Dan Boone]

If someone reads the article and develops an understanding of how scopes work, it answers the question.

 

[Turbulent Turtle]

How does this ^^^ answer this:

Short answer, it doesn't. People replying to say read the article didn't understand the article.

The reason I asked about the side focus versus an OA is because of how a side focus works in the first place.

An adjustable objective, the one where the front lens (the objective) is directly manipulated to adjust the focus of the objective onto the focal plane of the reticle, will not be affected by any movement of the erector set or the eyepiece; it's totally separate and it acts just line a camera lens.

On the other hand, to me anyway, the side focus seems to do its work as a separate lens element after the objective and I believe its position is extremely critical, far more than an AO. This leads me to believe that where on the lens your focus is can throw off the focus since the lens elements are curved. I realize I may be all wet here and that it is very possible the whole thing is bogus, but if you lower or elevate the inner tube by a few millimeters as you adjust for elevation, the crispness of the focus could be disturbed because the lens isn't flat. But I freely admit that it's very possible, even likely I am wrong. In which case, be gentle with me; I'm overworked and a long way from home.

 

[BoydAllen]

This is really simple because you can see parallax for yourself. If you want to know if your scope requires a parallax adjustment when an elevation adjustment is made, do a test. Adjust the scope so that it has no parallax, put in any amount of elevation that you think suitable, and then check to see if you have parallax. It could not be simpler. The only tool that you need is your shooting eye.

 

[rardoin]

This is really simple because you can see parallax for yourself. If you want to know if your scope requires a parallax adjustment when an elevation adjustment is made, do a test. Adjust the scope so that it has no parallax, put in any amount of elevation that you think suitable, and then check to see if you have parallax. It could not be simpler. The only tool that you need is your shooting eye.

Come on Boyd...it MUST be more complicated than that?!?!?

 

[BoydAllen]

Nope