▁is ▁much ▁shorter ▁than ▁that ▁of ▁the ▁M k ▁I ▁version . ▁The ▁f / 4 ▁l ens ▁shares ▁the ▁same ▁conventional ▁design . ▁ ▁Mac ro ▁ ▁The ▁f / 2 . 8 ▁versions ▁are ▁not ▁true ▁ 1 x ▁macro ▁l enses ▁( 1 : 1 ); ▁the ▁f / 2 . 8 ▁M k ▁I ▁has ▁a ▁maximum ▁magn ification ▁of ▁only ▁ 0 . 2 9 x ▁and ▁the ▁f / 2 . 8 ▁M k ▁II ▁has ▁ 0 . 2 1 x . ▁The ▁f / 4 ▁l ens , ▁while ▁also ▁not ▁a ▁true ▁macro ▁l ens , ▁is ▁consider ably ▁closer ▁to ▁being ▁in ▁that ▁category . ▁The ▁f / 4 ▁has ▁a ▁switch - activ ated ▁" macro " ▁mode ; ▁at ▁ 7 0   mm , ▁the ▁maximum ▁magn ification ▁is ▁approximately ▁ 0 . 7 x ▁and ▁the ▁closest ▁foc using ▁distance ▁is ▁ 2 0   cm . ▁ ▁Spec ifications ▁ ▁See ▁also ▁▁▁ ▁Can on ▁EF ▁ 2 4 – 1 0 5 mm ▁l ens , ▁available ▁in ▁two ▁versions — one ▁an ▁L ▁class ▁l ens , ▁and ▁the ▁other ▁a ▁consumer - level ▁l ens — with ▁a ▁similar ▁but ▁slightly ▁longer ▁foc al ▁length . ▁The ▁L ▁version ▁has ▁a ▁maximum ▁a pert ure ▁of ▁f / 4 ▁and ▁image ▁stabil ization , ▁similar ▁to ▁the ▁ 2 4 - 7 0 mm ▁f / 4 L ▁IS ▁US M , ▁but ▁la cks