▁of ▁view ▁to ▁account ▁for ▁the ▁relative - to - 3 5 mm ▁c rop ▁factor . ▁Some ▁of ▁these ▁l enses ▁have ▁surv ived ▁and ▁are ▁now ▁market ed ▁towards ▁use ▁on ▁" AP S " ▁digital ▁SL R s ▁for ▁the ▁same ▁reason . ▁In ▁reference ▁to ▁digital ▁cam eras , ▁A PS ▁may ▁also ▁mean ▁active ▁pixel ▁sensor , ▁a ▁type ▁of ▁C M OS ▁image ▁sensor . ▁ ▁A do ption ▁▁ ▁The ▁Advanced ▁Ph oto ▁System ▁was ▁an ▁attempt ▁of ▁a ▁major ▁upgrade ▁of ▁phot ographic ▁technology ▁for ▁am ateurs , ▁but ▁was ▁soon ▁over t aken ▁by ▁the ▁popular ity ▁of ▁digital ▁phot ography . ▁Despite ▁the ▁added ▁features , ▁A PS ▁never ▁really ▁caught ▁on ▁with ▁professional ▁photograph ers ▁because ▁of ▁the ▁significantly ▁smaller ▁film ▁area ▁( 5 8 % ▁of ▁ 1 3 5 ▁film ). ▁Color ▁slide ▁film , ▁popular ▁with ▁professional ▁photograph ers , ▁proved ▁un pop ular ▁in ▁A PS ▁format ▁and ▁was ▁soon ▁dis cont in ued ▁( although ▁chrom ogen ic ▁black - and - white ▁IX 2 4 0 ▁film ▁continued ▁to ▁be ▁produced ). ▁Color ▁print ▁film ▁was ▁normally ▁available ▁only ▁in ▁a ▁limited ▁selection ▁of ▁film ▁spe eds . ▁These ▁develop ments , ▁combined ▁with ▁the ▁fact ▁that ▁auto - loading ▁ 3 5 mm ▁cam eras ▁could ▁be ▁made ▁almost ▁as ▁compact , ▁as ▁convenient , ▁and ▁as ▁in exp ensive ▁as ▁A PS - format ▁cam eras , ▁prevent ed ▁A PS ▁from ▁att aining