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Scope questions...

Discussion in 'Scopes & Optics' started by JeremyK, Sep 2, 2015.

  1. JeremyK

    JeremyK Milwaukie Professional BA

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    Ok so I'm not at al familiar with scopes and whatnot, so
    In the interest of furthering my firearms knowledge, I would hope someone could answer this questions: what do all the numbers mean??

    3x9x4o?

    6.5x20?

    15-45x60mm?

    3.5-10x44?

    What does it all mean?
     
    Sgt Nambu likes this.
  2. Reno911

    Reno911 Hillsboro Well-Known Member 2015 Volunteer 2016 Volunteer

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    3 times normal view power zoom. 1 being what you regularly see. Through 9 times normal view zoom by a 40mm objective lens.

    6.5 power zoom with a 20mm objective lens.

    15-45 power zoom with a 44mm objective lens.

    3.5 to 10 power zoom with a 44 mm objective lens.

    Usually the first set is the magnification rather a fixed power or a range of. The second number being the size of the objective lens.
     
    Sgt Nambu likes this.
  3. 41Slinger

    41Slinger Harrisburg Oregon Bronze Supporter Bronze Supporter

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    3x9x40
    Three times magnification thru nine times magnification.
    40 is the diameter of the objective glass or front of the scope.
    Same formula for the others. The 6.5x20 is not giving you the objective glass measurement so it's just magnification.
    1" tube or 30 mm tube is the size of the body between the front and rear of the scope, this determines the size of the rings you'll need to mount the scope to the firearm.
    Always ask if you don't know, no such thing as a dumb question, especially with firearms and power tools, lol.
     
  4. B5Ben

    B5Ben Boise Well-Known Member

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    First set is magnification range, 3-9x, 4-12x, 4-16x, etc. if it's a fixed power scope it will only have one number.

    The last number will be the objective diameter in millimeters. Some will have AO for adjustable objective or SF for side focus to be able to adjust focus on your target.
     
  5. JeremyK

    JeremyK Milwaukie Professional BA

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    Do what is the objective diameter, then?
     
  6. Sgt Nambu

    Sgt Nambu Oregon Bronze Supporter Bronze Supporter

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    It is the diameter of the lens at the end of the scope. That is, opposite the eyepiece. The larger objective lenses have more light gathering ability. Useful in twilight conditions!:)
     
  7. edslhead

    edslhead Vanc Gold Supporter Gold Supporter Silver Supporter Bronze Supporter

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  8. JeremyK

    JeremyK Milwaukie Professional BA

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    Alright gotcha; this is why I love this site, I wanted clarification on something and within 15 minutes, three members jumped in to answer my question. Thanx guys!