> as lemmas
back focus
back focus n.
Brit. 
/ˈbak ˌfəʊkəs/
, /ˈbak ˌfəʊkəs/U.S. /ˈbæk ˌfoʊkəs/
in Photography (see quots.)./ˈbæk ˌfoʊkəs/ΘΚΠ
society > leisure > the arts > visual arts > photography > action of taking photograph > technical factors > [noun] > type of focusing
depth of field1855
circle of least confusion1867
flatness of field1867
infinity1867
register1890
fixed focus1892
back focus1897
circle of confusion1906
isocentre1931
split-field1941
split-image1950
1897 E. J. Wall Dict. Photogr. (ed. 7) 295 ‘Back focus’..is the distance between the posterior lens and ground-lens.
1953 S. W. Amos & D. C. Birkinshaw Television Engin. I. ix. 202 The distance between the lens and the image, known as the back focus.
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