ch " ▁and ▁then ▁completely ▁post - rep la cing ▁all ▁sound ▁and ▁dialog .) ▁ ▁In ▁America , ▁The ▁P ana flex ▁became ▁the ▁industry ▁standard ▁motion ▁picture ▁camera , ▁disp la cing ▁the ▁Mitchell ▁legacy . ▁ ▁G S MO ▁The ▁studio ▁quiet ▁ 1 6 mm ▁Cinema ▁Product s ▁G S MO ▁was ▁introduced ▁in ▁the ▁mid - 1 9 7 0 s . ▁It ▁had ▁quick ▁loading ▁co ax ial ▁mag az ines , ▁an ▁' in ▁camera ' ▁light ▁meter ▁view able ▁in ▁the ▁e y ep ie ce ▁and ▁an ▁on - camera ▁battery . ▁The ▁G S MO ▁stood ▁for ▁" gun ▁sight ▁man ▁operated ". ▁( C in ema ▁Product s ▁would ▁often ▁develop ▁products ▁under ▁government ▁contract s , ▁then ▁adapt ▁them ▁for ▁industry ▁wide ▁market ing .) ▁ ▁The ▁G S MO ▁was ▁popular ▁among ▁document ari ans ▁and ▁low - bud get ▁independent ▁produ cers . ▁ ▁Jon ▁J ost ▁produced ▁feature ▁films ▁shot ▁with ▁the ▁G S MO . ▁ ▁The ▁P BS ▁document ary ▁film ▁Post ▁No ▁B ills ▁was ▁also ▁shot ▁by ▁Clay ▁Walker ▁using ▁J ost ' s ▁G S MO ▁camera . ▁ ▁The ▁G S MO ▁had ▁cry stal ▁spe eds ▁of ▁ 1 2 , ▁ 1 6 , ▁ 2 4 , ▁ 2 5 , ▁ 3 2 , ▁ 4 8 , ▁ 6 4 ▁F PS . ▁Besides ▁the ▁standard ▁ 4 0 0 - foot ▁magazine , ▁the ▁G S