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It is a system consisting of one or more lenses, or a mirror, which has the function of converging the real image of the object observed in a Focus; This will then be enlarged by the eyepiece.
Telescopes with an objective consisting of lenses are called refractors; those who have a mirror, relfectors. In good quality refractors, the objective consists of a system of lenses that have different refractive index (typically a flint lens and a crowm) in order to eliminate chromatic aberration. The reflectors do not have chromatic aberration, but are affected by other aberrations such as the spherical.
A fundamental characteristic of the objective is the focal relationship, that is, the relationship between its focal length and its diameter.
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