▁to ▁use ▁a ▁F ove on ▁X 3 ▁sensor ▁was ▁the ▁S igma ▁SD 9 , ▁a ▁digital ▁SL R ▁launched ▁in ▁ 2 0 0 2 . ▁This ▁used ▁a ▁ 2 2 6 8 ▁x ▁ 1 5 1 2 ▁× ▁ 3 ▁( 3 . 5 4 ▁× ▁ 3 ▁MP ) ▁iteration ▁of ▁the ▁sensor , ▁and ▁was ▁built ▁on ▁a ▁S igma - des igned ▁body ▁using ▁the ▁S igma ▁SA ▁mount . ▁The ▁camera ▁was ▁followed ▁in ▁ 2 0 0 3 ▁by ▁the ▁improved ▁but ▁techn ically ▁similar ▁S igma ▁SD 1 0 , ▁which ▁was ▁in ▁turn ▁su pers eded ▁in ▁ 2 0 0 6 ▁by ▁the ▁S igma ▁SD 1 4 , ▁which ▁used ▁a ▁higher - resol ution , ▁ 2 6 4 0 ▁× ▁ 1 7 6 0 ▁× ▁ 3 ▁sensor . ▁The ▁successor , ▁the ▁S igma ▁SD 1 5 , ▁was ▁released ▁in ▁June ▁ 2 0 1 0 ▁using ▁the ▁same ▁ 2 6 4 0 ▁× ▁ 1 7 6 0 ▁× ▁ 3 ▁( 4 . 7 × 3 ▁MP ) ▁sensor ▁as ▁the ▁SD 1 4 . ▁The ▁S igma ▁SD 1 ▁was ▁released ▁in ▁June ▁ 2 0 1 1 ▁with ▁a ▁new ▁ 4 8 0 0 ▁× ▁ 3 2 0 0 ▁× ▁ 3 ▁sensor ▁developed ▁for ▁the ▁professional ▁market . ▁ ▁In ▁ 2 0 0 4 , ▁Pol ar oid ▁Cor p . ▁announced ▁the ▁Pol ar