objectif macro

CONT: [One approach to taking close-ups] is the use of special lenses called macro lenses. Such lenses have two advantages: 1) They are optically corrected for close distances, to produce sharper images than regular lenses, which are optically corrected for greater distances. 2) Some are manufactured with built-in lens extension focusing, so that they focus up to magnifications of 0.5 x or 1.0 x without the need for accessory extension devices.