Re: scope power
Nice, dertailed post #5, LDBennet.
I will add that most inexpensive scopes are not constructed as internally robust as higher priced scopes. For example Bushnell's 4200 series scopes are advertised to be designed and able to take 10,000 shots on a .375 H&H Magnum rifle; while their 3200 series is just 2000 shots on the same gun.
Another item that bears mention is the power of any optical system. More power with diminished brightness and clarity is typical of inexpensive variable power scopes, both sighting and spotting. Real world usable power is limited by both the diameter of the objective (front) lens group and the diameter of the body tube on a scope sight. There are some high end and high priced exceptions to the following; but, generally speaking, variable power scopes are limited roughly as follows: 20 mm x 3/4" tube, 7X max.; 40 mm x 1" tube, 15X max.; 50 mm x 1" tube, 20X max; 56 - 60 mm needs bigger than a 1"tube and is limited to about 30X max.
Generally speaking, when you try to exceed the above power limits, image quality and brightness goes down greatly, and you end up seeing less not more.