Eye relief

Eye relief

This is a discussion on Eye relief within the Defensive Rifles & Shotgun Discussion forums, part of the Related Topics category; can someone define eye relief as it applies to acogs and other optics...

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Thread: Eye relief

  1. #1
    Member Array draco1's Avatar
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    Eye relief

    can someone define eye relief as it applies to acogs and other optics


  2. #2
    Member Array Czampion's Avatar
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    Eye relief refers to the distance between the eyepiece of the scope (or screen of a holosight) and the focal point of the lens where the shooter's retina must be placed. Well made scopes have long eye relief, meaning you don't have to press your eye up close to the optics for a full-field view. You've probably used low-grade optics before and noticed how difficult it is to get a full view from the scope because your eye had to be "just-so." Scopes with longer eye relief tend to have more usable space in which you can negotiate a good view without getting the position of your eye absolutely perfect. Long eye relief is better for quick target aquisition.

  3. #3
    Ex Member Array Ram Rod's Avatar
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    I could try to explain it, but the internet does so much better. I love the internet....don't you?
    Optic Relief

  4. #4
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    Ideal eye relief for the RCO is 2 1/2" if my memory serves me correctly from the range I just shot with it. Basically you should be able to see the whole reticle without any scope shadow in an RCO (or ACOG if you prefer, its the same thing). When you can do that, you have proper eye relief. Obviously wearing gear and changing positions will change your eye relief, but you make so with what you can on it.
    Fortes Fortuna Juvat

    Former, USMC 0311, OIF/OEF vet
    NRA Pistol/Rifle/Shotgun/Reloading Instructor, RSO, Ohio CHL Instructor

  5. #5
    VIP Member Array Rob72's Avatar
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    If you're shopping, I would suggest that the ACOG is over-priced and under-featured. Aimpoint is a better "dot" system; IOR, US Optics, Leupold, Burris etc., with illuminated reticles are better magnified/fast acquisition sights.

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