Owner's Manual

Table Of Contents
The!reduction!from!a!44mm !flange!back!distance!in!the!EF!mount!system!to!the!20!mm!of!the!new!RF!
mount!system !op ens!important!additional!degrees!of!freedom!in!lens!designs.!!The!pivotal!innovation!
offered!by!this!short!distance,!combined!with!the! large!54!mm! diameter! RF!mount!!is!the!f re ed o m!to!
deploy!large!diameter!optical!elements! at! the!very!rear!of!the!lens! and!closer!to!th e!large!image !senso r.!!
This!adds!new!optimization!capabilities!to!the!lens-camera!imaging!interface.!
!!!!!!!!!!!!!!!!!!!!!!!
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Figure&8!!! The$ new$ lens$ m ount$ significantly$ expands$ th e$ deg rees $ of$ freedom $ in$ mo bilizing$ the$
multiple$variables$in$hig h -end$lens$de sig n $to $im plem e nt$a$fa r$grea ter$ran g e$of$zo om $a nd $prim e$len ses!
!
The!new!RF!mount!makes!possible!greater!lens!design!flexibilities:!
1. Large!diameter!rear!lens!elemen ts!that!are!much!closer!to!the!full!frame!image!sensor!!
enhancing! overall! optical! perfo rm a nce ! (in! particular,! tighter! control! over! optical!
aberrations!at!image!extremities)!!
!
2. Lenses! having!the!sam e!specific a tio n s!for!fo ca l!leng th !an d !m ax im u m! a p er tu re !as!cur ren t !EF!
mount!lensesbut! having$ significantly$ higher$ image$ quality! ! within! the! same! size! and!
weight!
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3. High!o p tic al!p e rfo rmance,!la r ge !a p e r tu r e !(F 1.2)!prime!lense s!f or !fu ll!fra me!came ra s!
!
4. Zoom! lenses!of! higher!brightness! with!constant! aperture!over! their!focal! ranges!! while!
still!modest!in!size!and!weight!
The!following! section!is!intended !to!conv ey!the!critical!importance !of!back!focus!d istan ce!and!re ar!lens!
diameter!on!the!overall!optical!performance!of!a!given!lens.!
9!