...Then, as objects came slowly into focus beforehis eyes, he knew that above him a ray of light was strikingslantingly through the thick glass of a control-room lookout... 
Various 「Astounding Stories, August, 1931」
...A moment they sharpened in their gaze as he brought his visitor into focus...
Rafael Sabatini 「Captain Blood」
...A strong flare, centred from two ship reflectors overside, made a focus of illumination that subdued, but could not quench, the soft moonlight with which all outside was silvered...
Stewart Edward White 「African Camp Fires」
..." It is often impossibleto get every object in the field in focus at one time;—lookonly at that which is in focus, and be blind to allthe rest...
Henry J. Slack 「Marvels of Pond-life」
...Amongthe Ainos the Bear is what psychologists rather oddly call the main“food focus,” the chief “value centre...
Jane Ellen Harrison 「Ancient Art and Ritual」
...The focal attention iscentred on the Infanta, with the figures on either side more orless out of focus, those on the extreme right being quite blurred...
Harold Speed 「The Practice and Science Of Drawing」
...But in all painting that aims at reproducing theimpressions directly produced in us by natural appearances, thisquestion of focus and its influence on the quality of your edges isof great importance...
Harold Speed 「The Practice and Science Of Drawing」
...Looking at trees with a very wide focus, heignored individual leaves, and resolved them into masses of tone,here lost and here found more sharply againstthe sky...
Harold Speed 「The Practice and Science Of Drawing」
...It is assumed that the photographer knows exactly what the focus of his lens is, and that he is able to measure accurately from its optical center...
John A. Tennant 「Bromide Printing and Enlarging」
...The lines A B C represent parallel rays which pass through the lens, D D,and meet at F; this point being the principal focus, its distance from thelens is called the focal length...
Samuel D. Humphrey 「American Handbook of the Daguerrotype」
...Those rays of light which are traversinga parallel course, when they enter the lens are brought to a focus nearerthe lens than others...
Samuel D. Humphrey 「American Handbook of the Daguerrotype」
...Are the tablets in focus with the ground-glass? If you can attributethe failure to none of these, mix a new box of some other kind of quick,say the dry, for instance...
Samuel D. Humphrey 「American Handbook of the Daguerrotype」
...Being thus the centre of the political power of the empire, the RomanForum became also the focus of its architectural and civic splendour...
Hugh Macmillan 「Roman Mosaics」
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