' s ▁rug ged ▁construction ▁and ▁t ough ▁metal ▁body . ▁Un like ▁the ▁F - 1 , ▁the ▁EF ▁does ▁not ▁support ▁any ▁motor ▁drive ▁for ▁film ▁transport . ▁Ne ither ▁does ▁it ▁provide ▁any ▁inter change able ▁view find er . ▁ ▁The ▁Can on ▁EF ▁contained ▁a ▁sil icon ▁phot oc ell ▁light ▁meter ▁with ▁a ▁range ▁of ▁E V ▁ 1 8 ▁to ▁E V ▁- 2 ▁which ▁measured ▁light ▁in ▁a ▁" central ▁emphas is ▁meter ing " ▁pattern ▁( also ▁called ▁center ▁weight ed ▁average ▁meter ing ) ▁with ▁less ▁influence ▁from ▁the ▁top ▁of ▁the ▁frame , ▁to ▁minim ize ▁und ere x pos ure ▁due ▁to ▁a ▁bright ▁sky line . ▁Note ▁that ▁this ▁requires ▁the ▁camera ▁to ▁be ▁held ▁hor izont ally ; ▁taking ▁vert ically ▁orient ed ▁pictures ▁requires ▁some ▁care ▁by ▁the ▁user . ▁The ▁Can on ▁EF ▁could ▁operate ▁" Variable ▁A pert ure ▁A E " ▁mode ▁( comm only ▁called ▁sh utter ▁priority ) ▁or ▁full ▁manual ▁mode , ▁where ▁the ▁operator ▁would ▁control ▁both ▁the ▁sh utter ▁speed ▁and ▁the ▁a pert ure . ▁When ▁used ▁in ▁automatic ▁mode , ▁it ' s ▁possible ▁to ▁lock ▁the ▁current ▁a pert ure ▁value , ▁then ▁re compose ▁the ▁picture , ▁if ▁desired , ▁by ▁pressing ▁the ▁small ▁silver ▁button ▁next ▁to ▁the ▁film ▁re wind ▁kn ob . ▁ ▁Autom atic ▁expos ure ▁required ▁the ▁F D - mount ▁l enses . ▁In ▁ 1 9 7 5 ,