Ever used a spotting scope out in the field or at the range and had to visually sight along the tube with your un-aided eye just to line up the target? The field of view is pretty small at full magnification isn't it? Well that is the problem with large magnification gunscopes. If you are trying to pick out a target in the brush or trees you want a low-mag, large field of view to quickly find the spot in a hurry, like GB said. No need for anything much higher than 6X, or time to crank up the magnifcation for that 300yd. elk bugling for his girl friend.