Eye relief on 1x optics?

[LooseGrouper]

Could someone please explain to me why true 1x optics still have a limited eye relief?

I am looking for a battery free option with similar capabilities to Eotechs and Aimpoints. I'm not a fan of the way reflexive sights perform in some light conditions. I found the Leupold Prismatic sight and thought that was the ticket until I noticed it required 3-5" eye relief.

So, are there any 1x optics with just plain old regular crosshairs/reticles that don't require a certain eye relief and are relatively parallax-free?

If not, why? I'm sure there is some scientific explaination dealing with focal planes, etc, and I'd like to know what it is.

Thanks

LG

 

[beatcop]

Not really an answer....but EO's & C-more's don't have an exit pupil like a conventional scope, so they can be used at any distance from the eye.

If you run a kill-flash any glare on the objective will be eliminated, you may want to try one out...The newer Aimpoints are pretty bright.

As far as the the whole eye relief issue w/ a conventional tube type scope, the exit pupil is what chokes out the image. If you look through a 1/4" hole 2 inches from your eye, you see quite a bit. If you hold it at arms length, you can't see much. I think there's a secondary problem that has to do with the focal point and the ability to see the crosshairs at a distance.

"If your scope is four power (4X), and your objective lens is thirty-six millimeters in diameter (36mm), divide 4 into 36 and it equals 9. Nine would be the exit pupil size in diameter in millimeters."

That's my guess!

 

[AK103K]

I'm not a fan of the way reflexive sights perform in some light conditions.

There is a solution here with the Aimpoints. You simply close the front cover, set the dot at a comfortable level, and use it like the old OEG type sights. You can move from light to dim/dark and back again and the dot stays at a constant brightness thats easy to see. No bloom or wash out.

This also eliminates the need for a killflash, which I always found to be very annoying.

 

[LooseGrouper]

Thanks for the input, guys, but I'm really not looking for anything that requires batteries (or fiber optics/tritium). I probably wasn't too clear, but when I said "reflexive" I was talking about sights like the Trijicon that use fiber/tritium.

My question is: "Why does something like a Leupold Prismatic have a limited eye relief when an Aimpoint/Eotech/reflexive sight does not."

beatcop, I appreciate the effort but I still don't understand. Why a 1x sight with a physical reticle requires a certain range of eye relief when red dot or holographic sight can "project" a reticle with little or no ill effects from various eye relief or allignments.

Sorry if I'm asking dumb questions. I'll try doing some more research.

 

[beatcop]

Hmmm, I believe the the size of a projected dot is constant, since it's projected onto one surface, although it can seem to "grow" by turning up the brightness, but the size of a conventional (tube scope) reticle is small and extremely thin. At arms length it would be invisible if there wasn't some kind of magnification/interaction with the lenses...the focal point is set for 3" (for example) away from the eye and therefore everything is in perspective.

I suspect that the Leupold has some kind of multiple lens arrangement that is more closely related to a "normal" scope and a bit different from the heads-up display versions. Well, that's my best bs answer.

Get a Trijicon Reflex.