Loading ...
Loading ...
Abstract&
The$Canon$EOS$ system$ is$ comprised$ of$ EF$lenses,$EF-S$lenses,$and$associated$cameras.$$This$system$is$
now$thirty$years$old.$$$It$remains$robust$and$innovative.$$$These $intercha n ge a b le $le n s-cameras$systems$
service$multiple$levels$of$the$global$imaging$marketplace$—$fro m $th e$h igh e st$p rofe ssio na l$le ve ls$to$the$
aspiring$new$ photographers$within$ the$ larger$ consumer$ base.$ $ $ But$ toda y,$ both$ still$ photog r a p h y $ and$
motion$imaging$are$branching$out$in$ multiple$directions$—$propelled$by$a$ m ovement$spawned$a$ decade$
ago$w ith$ the$arrival$ of$ the$hybrid$interchangeable$lens-came ra.$$Today,$even$ hig h $end$mov iemaking$and$
television$pro du ction $ q uite$ re ad ily$ inco rpo rate $Canon$ EOS$lenses$and$cameras$into$their$arsenal$of$image$
acquisition$tools.$Separately,$social$media$and$ diverse$w eb-based$ services$are$spawning$new$businesses$
and$creative$initiatives$in$still$and$motion$imaging.$$$
While$the$quest$for$more$resolution$remains,$the$pa st$decade$ ha s$also$seen$a$rapidly$growing$awareness$
of$other$dimensions$of$image$quality$—$ color$reproduction,$ dynamic$ range,$ and$ picture$ capture$rates.$$
Mirrorless$ cameras$have$emerged$and$have$a$growing$following.$ $Shooting$practices$are$unceasing$in$
their$diversity$and$inge nu ity.$$
Assimilating$all$of$these$movements$on$a$worldwide$scale$led$Canon$to$the$conclusion$that$a$juncture$has$
been$reached$where$new$flexibilities$were$imperative$to$expand$the$possibilities$of$the$Canon$EOS$system$
to$support$future$decades$of$both$still$an d$motion$imaging$—$in$a ll$of$their$manifesta tio n s .$$$Given$ that$
optics$is$ the$very$core$ of$ Canon$ led$ to$ a $ conclusio n $ that$ new$ lenses$ offering$ im p orta n t$ e nh an cements$
must$constitute$the$ spearhead$of$ this$initiative.$In$ turn,$this$ would$be$ predicated$ on$ the$ design$ of$ a$ new$
lens$mount$tha t$ w ou ld$ e m po w er$lens$dev elo p ments$to$be$take n $ t o $ n e w $levels.$$ $$Continuing$support$of$EF$
and$EF-S$lens es $w o u ld $b e $fa cto re d $in to $t he $n e w $s ys te m$design.$
This$ white$ paper$ will$ discuss$ in$ some$ detail$ the$ new$ lens$ mount$ design$ and$ its$ implications$ for$ an$
importa n t $ne w$generation $o f$le ns e s$a n d $ca meras.$
&
1.0& HISTORY&OF&THE&CANON&EOS&SYSTEM&
In!198 7 !C a n o n ! lau n c h e d !a ! n ew!imaging! sy st e m ! th a t! tr an s fo r m e d ! th e !world!of!p h o to g ra p h ic !imaging.!Th e!
Canon! EO S! system! was! squarely! based! upon! an! innovative! new! lens! m ount! that! had! the! following!
attributes:!
1. Large!54mm!inner!diameter!mount!—!term ed!the!EF!mount!
!
2. Flange!back!distance!o f!44mm!
!
3. Flexible !e lec tro n ic !co mmunicatio n!b e tween!lens!an d!c a m e ra.!!
!
4. Large!diameter!mount!opened!broad!options!in!lens!design.!!!!
It! allo wed! larg e ! apertu r e! lens! design s ! that! main ta in e d ! high! optica l! perfo rmance.! Central! to! this!
design!was! the! total! absence! of! mechanical!linkages! between! the!moving!parts!within! the! lense s!
and!the!camera.!
1!
Loading ...
Loading ...
Loading ...