A camera includes a housing, a camera lens and a supplemental lens mechanism positioned on the housing and located in front of the camera lens. The supplemental lens mechanism includes a supplemental lens set, a carousel, a holder, a bracket, and a positioning ring. The supplemental lens set includes a number of supplemental lenses configured for producing different imaging effects. The carousel is disposed in front of the camera lens. The holder joins with the carousel to hold the supplemental lens set. The bracket is disposed in the housing of the camera and accommodates/carries the carousel. The positioning ring couples to the bracket to hold the carousel. The carousel can rotate in the bracket to make a selectable one of the supplemental lenses in the supplemental lens set align with the camera lens.