Variable scopes of that high of magnification are rather rare The most magnification I know of is four times from the erector system . The way a scope works is it takes the magnification of the objective lens and multiplies it times the power of the erector cell and then multiplies that figure by the power of the eye piece. This means the focal length of the objective must be pretty long and due to the restricted light transmission it would have to be very large.. You have about as high powered a variable that will give good images as they make. In the 24X
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