ˈfocusing, vbl. n.
[f. as prec. + -ing1.]
1. The action of the vb. focus (gerundially).
| 1851 Ruskin Mod. Paint. II. iii. i. v. §18 The right gradation or focusing of light and colour. 1881 Mivart Cat 295 The focussing of rays coming from points varying in remoteness. 1883 A. Barratt Phys. Metempiric 217 Thought is the focussing of phenomena into a universe. |
2. attrib. and
Comb., chiefly in names of appliances used by photographers, as
focusing screen,
focusing tube;
focusing cloth (see
quot. 1890);
focusing-glass (see
quot. 1858).
| 1853 in Jrnl. Photogr. Soc. I. No. 3. 39/2 A *focusing cloth. 1890 Woodbury Encycl. Photogr., Focussing Cloth, a black cloth used for covering over the head and back portion of the camera to exclude all extraneous light. |
| 1853 in Jrnl. Photogr. Soc. I. No. 3. 39/2 The *Focusing glass. 1858 T. Sutton Dict. Photogr., Focussing Glass..a magnifier used for the purpose of magnifying the image on the ground glass, and enabling the operator to get it into better focus. |
| Ibid. 56 The real image formed by a convex lens is received on a *focussing screen. |