White paper

11.1.2&&&&MTF&of&RF28-70mm&F2&L&USM&and& Equivalent&EF&Zooms!
Figure!16!shows!the!MTF!curves!for!the!new!EF28-70mm !F2!L!USM!on!the!right!compared!with!those!of!
two!establishe d!EF !zoo m !lense s!—!with!all!three!lenses!set!at!maximum!aperture.!!Of!special!note!are!
the!following:!
1. 10!Lp/mm!Sagittal!of!the!new!F2!lens!is!very!close!to!that!of!the!EF24-70mm!f/2.8L!II!USM!lens!
(slightly!better!at!m aximum!image!heig ht)!an d !is!much!higher!than!the!EF24-70mm!f/4 L!IS!USM!
lens!at!m a x !he ig h t!!!
!
2. 10!Lp/mm!Meridional!approximates!the!performance!of!EF24-70mm!f/2.8L!II!USM!at!the!image!
extremity,!!but!it!!is!much!better!than!the!EF24-70mm!f/4L!IS!USM!lens !a t!maximum!image!
height!
!
3. 30!Lp/mm!Sagittal!behavior!is!considerably!better!!than!the!EF24-70mm !f/2.8L!II!USM!at!
maximum!image!height!and!is!far!higher!than!that!of!the!EF24-70mm!f/4L!IS!USM!
!
4. 30!Lp/mm!Meridional!curve!for!the!RF28-70m m!F2!L!USM!is !h igh e r!fro m!image!cen te r!t o!a n !
image!h e ig ht !o f!1 5 m m!than!both !E F!z o o m !lenses!and!is!equivalent!to!EF24-70mm!f/2.8L!II!USM!
at!image!extremity!—!but!much!better!than!EF24-70mm!f/4 L!IS!USM!at!the!extremity!
!
Figure&16! Comparative$MTF$Behavior$of$RF28-70mm$F2$L$USM$versus$equivalent$EF$zoom$lenses$at$
the$wide$ang le$setting $(a ll$lense s$set$to $m ax im um$aperture)$
17!