Therefore, for general purpose hunting, a scope with magnification in the range of 3x to 10x works fine for many hunters. The 4x40 scope has an exit pupil of size 10 mm., whereas the 10x40 has an exit pupil of 4 mm.Ī scope with higher magnification is useful against targets at a long distance, but not as useful against targets close by. This has to do with the exit pupil, which we studied about in the last post. The image seen through the 4x40 will be brighter than that seen through the 10x40.
They both have the same size objective lens (40 mm.), but they have different magnification power 4x and 10x. For instance, if you have two scopes, a 4x40 and a 10x40. Higher magnification also reduces the brightness of the image.
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