Owner's Manual

Table Of Contents
11.1.1&&&&&&&&&&&&&&&&&&MTF&Characteristics&of&the&RF28-70mm&F2&L&USM& Le ns&
The!M TF!curves!in!Figure!15!show!the!behavior!of!this!lens!measured!at!four!distances!from!the!image!
center.!!Two!sp atial!frequencies!are!used!—!one,!at!the!low!10!line!pairs!per!millimeter! (LP/mm)!which!
is! a n ! imp o rta n t! me a su re ! of! the! con tra st ! of! the! lens,! and ! the! seco n d ! is! at! a! higher! 30! LP/m m! which!
indicates ! re so lv ing ! p o w e r.! !T wo!sepa ra te !measure m e n ts !a re ! made!for !e a ch ! at !r igh t !a n g les !t o !e a ch ! o th e r. !!
The!term!“image!height”!refers!to!how !far! toward!any!of!the!four!corners! of!the!image!a!measurement!
is!taken!a s!s h o w n !in !th e !fig ur e!b e lo w .!
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Figure& 15$$$$$MTF$characteristics$of$the$RF28-70mm$ F2$L$USM $—$the$wide$ a pertu re$ se tting$ o n$ th e$ left$ an d$
telephoto$on$right$
16!