AR Sponsor
Posted: 1/2/2014 5:54:52 PM EDT
| I am familiar with the turrets on scopes for Windage and Elevation. However, I noticed a third turret that I think is called Side Focus. What is this and how important is this for in relation to the Windage & Elevation? Would it matter if the Side Focus not included in the scope? Thanks. |
|
Side focus is to fine tune for parallax at your shooting distance. Most of the side focus turrets are marked for yardage. Eyepiece focus is to bring your reticle into sharp focus as you look through the scope.
Side focus is usually found on target and long range high magnification scopes. Most scopes are preset for zero parallax at 100 yards and are close enough at other ranges not to need manual adjustment. General purpose scopes up to 3-9x usually do not need side focus for parallax adjustment and do not have it. All scopes will have some form of eyepiece focus to sharpen the reticle. |
|
Quoted:
Focus rings can be mounted on the eyepiece or in a seperate turret. It has no bearing on accuracy, just the clarity. Being mounted on the side can be more convenient for some. What scope are you looking at in particular? No disrespect intended but you are indeed misinformed Sir. That is a parallax adjustment and if parallax exists, you potentially could have serious accuracy issues. The adjustment is there to allow you to remove the parallax completely. Some scopes have it on the objective and not the side of the scope. The focus adjustment is generally at the rear eyepiece and is something totally different |
|
Quoted:
No disrespect intended but you are indeed misinformed Sir. That is a parallax adjustment and if parallax exists, you potentially could have serious accuracy issues. The adjustment is there to allow you to remove the parallax completely. Some scopes have it on the objective and not the side of the scope. The focus adjustment is generally at the rear eyepiece and is something totally different Quoted:
Quoted:
Focus rings can be mounted on the eyepiece or in a seperate turret. It has no bearing on accuracy, just the clarity. Being mounted on the side can be more convenient for some. What scope are you looking at in particular? No disrespect intended but you are indeed misinformed Sir. That is a parallax adjustment and if parallax exists, you potentially could have serious accuracy issues. The adjustment is there to allow you to remove the parallax completely. Some scopes have it on the objective and not the side of the scope. The focus adjustment is generally at the rear eyepiece and is something totally different No disrepect, sir, but isn't that what I told OP in the post right above yours? No need to pile on. |
|
Quoted:
No disrespect intended but you are indeed misinformed Sir. That is a parallax adjustment and if parallax exists, you potentially could have serious accuracy issues. The adjustment is there to allow you to remove the parallax completely. Some scopes have it on the objective and not the side of the scope. The focus adjustment is generally at the rear eyepiece and is something totally different Quoted:
Quoted:
Focus rings can be mounted on the eyepiece or in a seperate turret. It has no bearing on accuracy, just the clarity. Being mounted on the side can be more convenient for some. What scope are you looking at in particular? No disrespect intended but you are indeed misinformed Sir. That is a parallax adjustment and if parallax exists, you potentially could have serious accuracy issues. The adjustment is there to allow you to remove the parallax completely. Some scopes have it on the objective and not the side of the scope. The focus adjustment is generally at the rear eyepiece and is something totally different This is correct. Most scopes have the parallax adjustment and focus built into one knob. The focus on the eyepiece is for the reticle only. Some high end scopes such as Kahles have a separate knob to focus the image and a knob to correct for parallax error. For scopes that have them built in to one knob it is always more important to remove the parallax error rather than having the image completely in focus. Parallax error can cause POI shifts. Yardage markers on the side focus knobs are seldom correct. |
|
Quoted:
This is correct. Most scopes have the parallax adjustment and focus built into one knob. The focus on the eyepiece is for the reticle only. Some high end scopes such as Kahles have a separate knob to focus the image and a knob to correct for parallax error. For scopes that have them built in to one knob it is always more important to remove the parallax error rather than having the image completely in focus. Parallax error can cause POI shifts. Yardage markers on the side focus knobs are seldom correct. Quoted:
Quoted:
Quoted:
Focus rings can be mounted on the eyepiece or in a seperate turret. It has no bearing on accuracy, just the clarity. Being mounted on the side can be more convenient for some. What scope are you looking at in particular? No disrespect intended but you are indeed misinformed Sir. That is a parallax adjustment and if parallax exists, you potentially could have serious accuracy issues. The adjustment is there to allow you to remove the parallax completely. Some scopes have it on the objective and not the side of the scope. The focus adjustment is generally at the rear eyepiece and is something totally different This is correct. Most scopes have the parallax adjustment and focus built into one knob. The focus on the eyepiece is for the reticle only. Some high end scopes such as Kahles have a separate knob to focus the image and a knob to correct for parallax error. For scopes that have them built in to one knob it is always more important to remove the parallax error rather than having the image completely in focus. Parallax error can cause POI shifts. Yardage markers on the side focus knobs are seldom correct. Pardon my ignorance. If I get this correctly, then a side focus knob is not that of a big thing? Unless only for long distance scopes? And the parallax removal is through the eye piece. |
|
Quoted:
Pardon my ignorance. If I get this correctly, then a side focus knob is not that of a big thing? Unless only for long distance scopes? And the parallax removal is through the eye piece. Quoted:
Quoted:
Quoted:
Quoted:
Focus rings can be mounted on the eyepiece or in a seperate turret. It has no bearing on accuracy, just the clarity. Being mounted on the side can be more convenient for some. What scope are you looking at in particular? No disrespect intended but you are indeed misinformed Sir. That is a parallax adjustment and if parallax exists, you potentially could have serious accuracy issues. The adjustment is there to allow you to remove the parallax completely. Some scopes have it on the objective and not the side of the scope. The focus adjustment is generally at the rear eyepiece and is something totally different This is correct. Most scopes have the parallax adjustment and focus built into one knob. The focus on the eyepiece is for the reticle only. Some high end scopes such as Kahles have a separate knob to focus the image and a knob to correct for parallax error. For scopes that have them built in to one knob it is always more important to remove the parallax error rather than having the image completely in focus. Parallax error can cause POI shifts. Yardage markers on the side focus knobs are seldom correct. Pardon my ignorance. If I get this correctly, then a side focus knob is not that of a big thing? Unless only for long distance scopes? And the parallax removal is through the eye piece. It becomes a big deal with scopes that have higher magnification. Usually above 10x. However, you can still maintain accuracy without adjusting for parallax as long as you maintain the exact same cheek weld through the scope for each shot. This is why many of us like 10x scopes without a parallax adjustment. The adjustments on the eyepiece do not have anything to do with parallax or image focus. They only focus the reticle itself. As mentioned above in another post this can be done with a fast focus eyepiece or a locking eyepice. It is also called a diopter adjustment. |
AR Sponsor