Owner's Manual

Table Of Contents
The! lens! deploys! three!high-refraction! aspheric! elements! —! sho w n! in! green! in! Figure! 19.! ! Chromatic!
aberrations!are!minimized!using!the!UD!ele ment!(dark !g re en ).!!!
Flare!and!ghosting!are!particularly!well!controlled!using!Canon’s!Super!Spectra!Coa ting s!!with!the!Air!
Sphere! Coating! (ASC)! technology! on! one! critically! positioned! lens! e le ment! sh o wn! in! Figure! 19.! ! ! Air!
Sphere!Coating!is!an!anti-refle ction !te ch no logy !th at!c ombines!the!existing!vapor-deposited!multi-layer!
coatings!w ith!an!ultra-low !refra ctive !index !outermost! la yer.!!ASC!significa ntly!red uce s!flare!and !ghostin g!
that! cannot! be! prevented ! with! conven tion al! vapor- deposited! multi-layer! coatings,! imp ro v in g! ant i-
reflection!performance.!!
This!lens!is!a!striking!example!of!the!powerful!new!flexibility!offered!by !the !new !RF!mount!in!achieving!
the!F 1.2!brightness! in!a!compact!lens.!!!To!achieve! this! level!of!optical! quality!in!an!F1.2! design!with!the!
standard! EF!mou nt! would! have!entailed! a! significantly! larger! lens.! !The!lens!enables!close-ups! from! a!
closest!focusing!distance!of!1.31!feet!an d!prod uces!b eautiful!bokeh!from!a!circular!aperture!with!a!10-
blade!iris.!
The!focusing!actuator!is!a!ring!USM!(ultrasonic!motor).!!!The!lens!has!a!10-blade!aperture!actuated!by!
EMD!(Electro!M agn e tic!Dia ph rag m)!which!supports!beautiful!rendering!of!out-of-focus!b ack gro un ds .!
The!front!filter!size!is!77!mm.!
!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!$$ $
Figure&20! Showing$ the$ Focus$ Mode$ and$ Focus$ Distance$ Range$ Selector$ switches$ while$ also$
outlining$where$dust$and$water$sealing$design$precautions$have$been$implemented$
20!