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Shooting Forum - Firearms licencing information


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New scope.

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    #32
    BillBen
    Registered Users Posts: 353 ✭✭BillBen


    Cheers had a look at the bushnell but the objective is only 42 I need 50 or 56 because I want to see as much of the target a possible.


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    #33
    Lemon3
    Registered Users Posts: 110 ✭✭Lemon3


    The bigger objective will not show you more of the target but will provide a slightly brighter image in low light. A higher quality 42mm scope will provide a brighter clearer image than a lower quality 50 or 56mm.


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    #34
    clivej
    Registered Users Posts: 7,057 ✭✭✭clivej


    Lemon3 wrote: »
    The bigger objective will not show you more of the target but will provide a slightly brighter image in low light. A higher quality 42mm scope will provide a brighter clearer image than a lower quality 50 or 56mm.

    Not quite correct

    The bigger objective lens will give a bigger 'Picture' to the eye.
    The way to calculate the size is to divide the objective lens by the zoom used. This will give you the diameter of the image that your eye will see when it is correct distance from the eye-piece lens and in focus (eye relief).
    Also tube diameter does not allow more light through. Just gives more clicks of the reticle.
    The image, what you see through the scope, is determined by the 'Field of View' of the scope and can be found in the spec of the scope. ie. so many feet at 100y or m/100m

    EG.

    Obj 30mm / 10 zoom = 3mm eye image
    Obj 60mm / 10 zoom = 6mm eye image
    Obj 60mm / 20 zoom = 3mm eye image


    BUT as said the better the glass the better the image


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    #35
    BillBen
    Registered Users Posts: 353 ✭✭BillBen


    Cheers Clive very informative. I'll be deciding on one of three scopes over the next few days.


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    #36
    Wadi14
    Registered Users Posts: 881 ✭✭✭Wadi14


    BillBen. make sure after all your decision making that you have a look through the scopes before purchasing, if club members have them great have a look at them and what the shooters think of them, don't buy a scope online without knowing it will do ur job, I'd hate to see you selling a NIGHT FORCE, or LEUPOLD or SWAROVSKI on here in a few weeks and me having to take it off your hands cheap lol


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    #37
    BillBen
    Registered Users Posts: 353 ✭✭BillBen


    Thanks for the advice. If I do buy and it's not suitable I'll give you first refusal. Lol


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    #38
    Lemon3
    Registered Users Posts: 110 ✭✭Lemon3


    clivej wrote: »
    Not quite correct

    The bigger objective lens will give a bigger 'Picture' to the eye.
    The way to calculate the size is to divide the objective lens by the zoom used. This will give you the diameter of the image that your eye will see when it is correct distance from the eye-piece lens and in focus (eye relief).
    Also tube diameter does not allow more light through. Just gives more clicks of the reticle.
    The image, what you see through the scope, is determined by the 'Field of View' of the scope and can be found in the spec of the scope. ie. so many feet at 100y or m/100m

    EG.

    Obj 30mm / 10 zoom = 3mm eye image
    Obj 60mm / 10 zoom = 6mm eye image
    Obj 60mm / 20 zoom = 3mm eye image


    BUT as said the better the glass the better the image


    Clive, what you are describing here is the exit pupil diameter, and its size has nothing to do with the size of the image at a given magnification. A 16x42 will provide the same size image to the viewer as a 16x60, the latter will just be brighter. At high magnification the difference in field of view, from scope to scope would be insignificant.


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