▁EF - S ▁ 1 8 – 5 5 mm ▁I / II ▁The ▁l ens ▁body ▁has ▁a ▁pl astic ▁construction , ▁including ▁the ▁l ens ▁mount . ▁Gener ally , ▁however , ▁this ▁version ▁of ▁the ▁l ens ▁is ▁soft ▁and ▁must ▁be ▁stopped ▁down ▁to ▁gain ▁acceptable ▁sharp ness . ▁Bar rel ▁dist ort ion ▁becomes ▁quite ▁notice able ▁at ▁the ▁wide - angle ▁setting ▁and ▁chrom atic ▁aber r ation ▁( pur ple ▁fr ing ing ) ▁is ▁common . ▁ ▁EF - S ▁ 1 8 – 5 5 mm ▁IS ▁I / II ▁On ▁ 2 0 ▁August ▁ 2 0 0 7 , ▁the ▁EF - S ▁ 1 8 - 5 5 m ▁IS ▁was ▁announced ▁along ▁with ▁the ▁E OS ▁ 4 0 D . ▁The ▁l ens ▁featured ▁improved ▁optical ▁quality ▁over ▁previous ▁versions ▁and ▁added ▁image ▁stabil ization . ▁ ▁On ▁ 7 ▁February ▁ 2 0 1 1 , ▁the ▁ 1 8 – 5 5 mm ▁ 1 : 3 . 5 – 5 . 6 ▁IS ▁II ▁was ▁announced ▁to ▁be ▁bund led ▁with ▁the ▁E OS ▁ 6 0 0 D ▁and ▁ 1 1 0 0 D . ▁ ▁EF - S ▁ 1 8 – 5 5 mm ▁IS ▁ST M ▁On ▁ 2 1 ▁March ▁ 2 0 1 3 , ▁the ▁ 1 8 – 5 5 mm ▁ 3 . 5 – 5 . 6 ▁IS ▁ST M ▁was ▁announced ▁alongside ▁the ▁E