Fo­cal length

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Op­ti­cal term de­scrib­ing the dis­tance be­tween the op­ti­cal cen­tre of a lens and its fo­cal point. The fo­cal length is a mea­sure of the mag­ni­fi­ca­tion and an­gle of view of a given lens or zoom set­ting, usu­ally mea­sured in mil­lime­tres. Its use­ful­ness as a way of com­par­ing dif­fer­ent lenses is di­min­ished by the fact that the ex­act fo­cal length re­quired to give a par­tic­u­lar an­gle of view will de­pend on the size of the imag­ing sen­sor used by the cam­era in ques­tion.

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