▁EF - S ▁l ens ▁mount . ▁The ▁field ▁of ▁view ▁has ▁a ▁ 3 5 ▁mm ▁equivalent ▁foc al ▁length ▁of ▁ 2 8 . 8 – 8 8 mm , ▁and ▁it ▁is ▁a ▁standard ▁k it ▁l ens ▁on ▁Can on ' s ▁consumer ▁A PS - C ▁D SL R s . ▁In ▁February ▁ 2 0 1 7 ▁Can on ▁announced ▁the ▁new ▁Can on ▁EF - S ▁ 1 8 – 5 5 mm ▁l ens ▁ 4 – 5 . 6 ▁IS ▁ST M ▁with ▁a ▁smaller ▁a pert ure , ▁which ▁made ▁the ▁l ens ▁ 2 0 % ▁smaller ▁according ▁to ▁Can on . ▁ ▁There ▁have ▁been ▁nine ▁iterations ▁of ▁this ▁l ens , ▁five ▁of ▁which ▁are ▁dis cont in ued ▁and ▁four ▁of ▁which ▁are ▁currently ▁in ▁production : ▁III ▁( kit ▁only ▁and ▁most ▁' basic '), ▁IS ▁II , ▁and ▁the ▁two ▁IS ▁ST M ▁l enses . ▁ ▁I ▁US M ▁( dis cont in ued ) ▁ ▁I ▁( dis cont in ued ) ▁ ▁II ▁US M ▁( dis cont in ued ) ▁ ▁II ▁( dis cont in ued ) ▁ ▁IS ▁( dis cont in ued ) ▁ ▁IS ▁II ▁( current ) ▁ ▁III ▁( current ) ▁ ▁IS ▁ST M ▁( current ) ▁▁ 4 - 5 . 6 ▁IS ▁ST M ▁( current ) ▁ ▁EF - S ▁ 1 8 – 5 5 mm ▁US M ▁I / II ▁/