Home Forums Hunting & Shooting Hunting Optics Q for the optics guys

If you have 2 variable power scopes of the same magnification range, If brand Z scope has a more generous eye box than brand X, will this translate into increased parallax?

I think you will find that scopes with more generous eyeboxes, especially when they Extended Eye Relief (and I'm not talking scout or pistol scopes) will have a slightly narrower field of view (FOV).

Parallax is a function of difference between barrel and scope center meeting at a distant object - a triangle.

Just a minute I'm callin E....

Surprised E hasn't replied yet, The dude is slipping..

I thought the Dude abideth...

He doesn't understand parallax.

No, it isn't.

Any idiot knows it is when 2 laxes come together. What a bunch of morons around here.......

So far we have had parallax incorrectly explained, formed a search party for E., but no one an answer whether there is a relationshp between forgiving eye boxes and parallax.

Ya' aren't the nerds I thought you were.

Since when did actual knowledge become a requirement to offer your opinion as fact around here?

Man, you guys are tough. You want an answer AND you want it to be correct. Sheesh!

Funny!! but very true..............Hb

Not sure which variables produce the largest eye-box, but understand that optical design compromises are sometimes made, in one area, in order to improve performance in another. Intuitively it seems that more head movement equals more chance for parallax error, since you are moving your eye farther from optimum position.

"There's more to optics than meets the eye."

I'm no expert but I'll take a stab at it.
No, parallax is when the reticle and the object you are looking at are not in the same focal plane. The "adjustment" for a parallax free setting is either fixed at the factory or has a manual adjustment (either the front lens or a side adjustment).

^^^ Dave is correct i believe. That's the way i've always understood parallax. When you experience parallax, the crosshairs will seem to "move" about the target when you move your head about the scope while looking through it.

search party, this place is cold--- making the assumption (you didn't specify) each scope had been adjusted for parallax -- no parallax exits if eye ball is behind optical axis distance . the shorter "eyebox" will show a faster rate of change in parallax as the eye is moved across the optical center (given the same power setting). moving the eye back in the longer one until the rate of change is the same will give the equal error.

I LOVE THE OPTICS FORUM!

It's always entertaining, no matter what's asked and answered.

Spoke with someone quite knowledgeable about scope design and he gave me an answer that makes perfect sense.

Most of my hunting is big game and hogs. Stalking hunts thus, max range is 100yds. Consequently I use a low magnification scope or a quality red dot type sight. Hogs like to run.
Over many years of scope use I have thought about what is the TRUE magnification.To me it always appears greater than stated.
Recently I performed some basic trials.
My results:
Leuopold-VXii 1-4X ,1X was 1.7X
Lueopold-VXiii 1.5-5,1.5x was 2X
Next was a budget scope
Redfield Revolution 2-7X, 2X was2.5X
Nikko 1-4X 30mm tube 1x was 1.4X
The Nikko is the best to use for full deflection shots both eyes open.
My results are not precise but ballpark orders of magnitude.

Is this issue my error of scope magnification or clever marketing.? I can think of a few marketing reasons.However,you Optics Guys have the answers to correct or confirm my assumptions.

Were you sworn to secrecy?

Thats fodder for a whole 'nother thread..