Rules of Magnification.

-The higher the power of the lens, the closer you must get to the object being viewed, and the smaller the field of view.

-As the power of a lens increases, the diameter of the lens decreases.

-Diopter is a term used to determine the power (magnification) of a lens. The terms are sometimes confused.

- High power magnifiers, such as 8x must be held steady, or else they will be out of focus.