It 'll different every camera lens , may need refer camera manufacturer 's guidance.What autofocus need low light ? Autofocusing brings reliable fast focus stills sometimes video , camera 's autofocusing systems detect light way.That 's 's important consider lowest reported autofocus detection range camera specified ( e.g.-4EV ) see well performs darker conditions.Generally , lower number , better ( i.e.-6EV better -4EV ) .Related articles :