Loading ...
Loading ...
Loading ...
11.1.1&&&&&&&&&&&&&&&&&&MTF&Characteristics&of&the&RF28-70mm&F2&L&USM& Le ns&
The!MTF!curves!in!Figure!15!sh ow !the!behavior!of!this!lens! m easured!at! four!distances! from!the!image!
center.!!Two!spatial!frequencies!are!used!—!one,!at!the!low!10!line!pairs! per!millimeter!(LP/mm)!which!
is! an! importa n t! measu r e! of! the ! contrast ! of! the ! lens,! an d ! the! sec o n d ! is! at! a ! higher! 30! LP /mm! which!
indicates ! re so lv ing ! p o w e r.! !T wo!separate !measureme n ts ! are ! made!for!ea ch ! a t! rig ht ! an g les ! to ! ea c h! 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 .!
&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&& &&&&
&
&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&& &
&&&&&&&&&&&&&&&&
&
Figure& 15$$$$$MTF$characteristics$of$the$RF28-70mm$F2$L$USM $—$the$ w ide$ a pe rture $s etting $o n $th e$ left$ an d $
telephoto$on$right$
16!
Loading ...
Loading ...
Loading ...