Owner's Manual

Table Of Contents
5.0& &&&&&&&AN&IDEAL&LENS-CAMERA&SYSTEM!!
Three! decades! after! the! debut! of! the! Canon! EOS! system! Can on! b elieves! that! new! and! broadening!
marketplace! dynamics! require! an! extension! to! the! original! design! premise! of! the! EF! interchangeable!
lens-cam era!system .!An!ideal!lens-camera!system!intended ! fo r!fu t ur e! ye a rs! in !imaging! would!include!the!
following! co ntem porary!considerations:!
1. Emerging!popularity!of!the!full!frame!image!sensor!
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2. Anticipated!progressive!elevation!of!sensor!resolution!
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3. Quest!for!higher!exposure!ranges!!
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4. Increasing! diversity! and! soph isticatio n! of! end-users! seeking! extended! operational!
functionalities !
All!of!these!considerations!bear!directly!on!the!lens!and!lens!mount!designs.!
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6.0& &&&&&&EXTENDING&LENS&DESIGN&OPTIONS&
There! continues ! to! b e! an ! inexorable! growth! in! the! needs! and! aspirations! of! the! multiple! creative!
communities!presently! engaged!in!both!still! and!motion!imaging.!!!Widely!differing!needs!in!zooms!and!
primes! encompass! a! spectrum! of! optical! performances,! size/weight! considerations,! and ! o perationa l!
features!!often!requiring!a!pragmatic!balance!between!these!three!cen tral!specifications!!Figure!4.!!!
Long!focal!ranges!combined!with!a!wide!aperture!—!as!required!for!sports!coverage!—! might!militate!
against!achievement!of!the!highest!optical!performance.!!!Lenses!intended!for!portraiture!m igh t!assign!
the! top! priority! to! overall! optical! pe rform a nc e! sp ec ification s! ! perhaps! at! a! cost! of! some! limit! to!
aperture!and!maybe!size!and!weight.!!!The!variations!in!diverse!s h o o tin g!r eq u ire ments!are !en d le ss .!
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!Figure&4! The$totality$of$lens$design$entails$many$parameters$that$bear$upon$three$key$criteria$
If!th e ! area!of!the! triangle! in!Figure!4! reflects! all!of!th e! optical,!optomechanica l,! and!electronic!design!
parameters! available! to!the!lens!designers,!th en!maximizing! that!area!offers!greater!options!in!favoring!
certain!specifications,!or!alternatively,!optimizing!the!balance!between!the!three!core!specifications.!
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