Diopter?

[Airedale1]

I've decided to buy a Ruger American Ranch in 5.56. I know I will want to mount a scope on it and I'm curious if rifle scopes come with a diopter?

 

[entropy]

A diopter is a unit of measurement of displacement of light by a prism. (specifically a diopter is how much prism is needed to move light one meter)

I believe you are referring to the adjustable eyepiece on the back of the scope which does have measurements in diopters, usually between plus and minus three, for the user to set for the best vision through the scope. Most good scopes have them.

 

[Airedale1]

A diopter is a unit of measurement of displacement of light by a prism. (specifically a diopter is how much prism is needed to move light one meter)

I believe you are referring to the adjustable eyepiece on the back of the scope which does have measurements in diopters, usually between plus and minus three, for the user to set for the best vision through the scope. Most good scopes have them.

Thank you! Forgive me I only know that term to be what I use to adjust clarity of view when I’m looking through the eyepiece of my camera.

 

[entropy]

Yup, the better scopes will have them. Some of the not so-good ones have them too.

 

[Airedale1]

Yup, the better scopes will have them. Some of the not so-good ones have them too.

Again, thank you. I’m looking at the Burris FF E1 4.5-14x42mm and I can’t find whether or not it has that adjustment in the specs. Hoping someone here will know?

 

[BigBL87]

Again, thank you. I’m looking at the Burris FF E1 4.5-14x42mm and I can’t find whether or not it has that adjustment in the specs. Hoping someone here will know?

If you are talking about parallax adjustment, then the FF E1 has side parallax adjustment.

If you are talking about the eyepiece focusing to your individual eye, it does that as well (as most decent scopes do).

 

[Airedale1]

If you are talking about parallax adjustment, then the FF E1 has side parallax adjustment.

If you are talking about the eyepiece focusing to your individual eye, it does that as well (as most decent scopes do).

Yes, I'm talking about the eyepiece focus to my eye. Thank you!

 

[entropy]

It does. If you look at the pic in Midway's listing on it in magnification (the little magnifying glass with the plus sign in it) on the back you can see the two arrows that say 'Reticle Focus' between them. (or on Burris.com)

Here's how to adjust them:



Despite the fact he says 'diopter' instead 'reticle focus' it's a good video on it.

Every time I use my lensometer in the lab, I have to do the same thing. I put a piece of white paper in front of the eyepiece, and adjust the reticle in the lensometer (they usually have something similar to a rifle's reticle) , then check the axis and power drums.

 

[Airedale1]

Very helpful! Thank you all!

 

[dranrab]

A lot of people get confused about eyepiece/ocular/diopter adjustment and parallax adjustment. The eyepiece adjustment is to get the reticle clear to the individual shooter's eyes. This could vary widely from shooter to shooter. This adjustment is made by rotating the eyepiece/ocular bell. I can't recall any modern scope not having an adjustable eyepiece.

The parallax adjustment brings the target into focus and eliminates parallax in the process. This adjustment is most often made by adjusting a knob on the side of the scope (side focus/SF) or on the objective bell (adjustable objective/AO.) A lot of modern scopes do not have SF or AO. They are "fixed parallax" scopes.

 

[Airedale1]

A lot of people get confused about eyepiece/ocular/diopter adjustment and parallax adjustment. The eyepiece adjustment is to get the reticle clear to the individual shooter's eyes. This could vary widely from shooter to shooter. This adjustment is made by rotating the eyepiece/ocular bell. I can't recall any modern scope not having an adjustable eyepiece.

The parallax adjustment brings the target into focus and eliminates parallax in the process. This adjustment is most often made by adjusting a knob on the side of the scope (side focus/SF) or on the objective bell (adjustable objective/AO.) A lot of modern scopes do not have SF or AO. They are "fixed parallax" scopes.

Thank you! Your explanation of the parallax adjustment is very helpful.

 

[Hugger-4641]

Welcome to THR! Lots of knowledgeable people here willing to help. I've never asked a question here that didn't get multiple very helpful answers.
I have several Burris scopes including the one you mentioned, I'm very happy with them. Please forgive my forwardness, but I do have one rather direct question after noticing your age: How good is your Eyesight?
You don't say what your plans are for this rifle, but if varmint hunting is the main goal, I'd suggest thinking about some of Burris scopes with 50mm objectives. For just a little more $ you can get the E1 6.5x20x50.

 

[Airedale1]

Thank you; yes this is an excellent forum. Although I'm 68 years old, I have excellent eyesight and I will take a look at the other Burris that you've suggested. Again, thank you.