front-cell focusing

Definition: Method of focusing an optical system by moving solely the front component, leaving the other elements in position. * Advantage is simple lens mechanism but not so easy to couple to range-finder and aberration correction is limited. * Best known in the Tessar series of lenses, in which only the front-element was focused: hence front-element focusing.

Previous Term: front projection  Next Term: f-theta lens

Type a photography term below to find its definition: