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The! lens! has! the! new! control! ring! —! with! 54! clicks! per! revolution.!! ! It! has! a! high! performing! optical!
image!stabilization!system!with! shake-correction!allowing!hand-holding!at!shutter! speeds!up!to!5-Stops!
slower!than!would!norm ally!be!possible!—!impressive !fo r!a!lens!having!a!brightness!of!F1.8.!!!
In! two! key! areas! a! not ab le ! improvement! was!implemented! in! this!new! 35! mm ! lens! co m p a re d ! to! th e !
well-known! EF35 mm ! f/2! IS!USM !le n s.!!The! o ve ra ll!length!o f! t h e!lens’s! o p ti ca l!path!is !shortened!from!1 0 5 !
mm! to!80.5!mm! and!the!all—impo rta n t! opera tio n a l! optical! speed ! of! the! lens! is! now! F1.8.!! Figure! 32!
shows!EF!35mm!f/2!IS!USM!on !th e !le ft!c o mpared!to!th e !n e w !le n s!on!the!right.!!!!
!!!!!!!!! !
Figure&32& !!!New! RF35mm $ F1.8$ M ACRO $ IS$ STM$ lens$ (on$ the$ right)$ having$ a$ large$ diameter$ rear$
element$helps$optimize$the$overall$image$performance$proje ct ed $o n $to $t he $full$fram e $im ag e$se ns or$
!
A!comparative!inspection!of!these!two!lenses!quickly!reveals!a!quite!radical!ch an ge!to!the!o vera ll! op tical!
assembly.!!!Note!the!large!final!lens!element!of!the!RF35mm!F1.8!MACRO!IS!STM!compared!to!that!of!
the! EF!lens.!!Of!sp ec ial!interest!are!the! sm aller!front! elements! in! the! new! lens!—!which!still!achieves!the!
faster!F1.8!maximum!aperture!because!of!the!large!diameter!iris!that!is!positioned!unusually!near!the!
front!of!the!lens .!!!The!entire!front!section!is!moved!to!focus!this!la test!35!mm!lens.!!!!But,!it!is!much!
smaller-diameter! and! lighter! in! weight,! making! it! p oss ible! to! s w itch! from! a! rin g-ty pe ! USM! to! the!
stepping!motor! (ST M )!focus! d rive!system.!!A mo ng!other!benefits,! this!change!to! STM !focus!drive! m eans!
much!smoother!focus!performance!when !the!len s -camera!system!is!used!for!v id eo !s h oo t in g. !
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28!
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