| 释义 |
ˈfocusing, vbl. n.
[f. as prec. + -ing1.]
1. The action of the vb. focus (gerundially).
1851Ruskin Mod. Paint. II. iii. i. v. §18 The right gradation or focusing of light and colour. 1881Mivart Cat 295 The focussing of rays coming from points varying in remoteness. 1883A. 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).
1853in Jrnl. Photogr. Soc. I. No. 3. 39/2 A *focusing cloth. 1890Woodbury Encycl. Photogr., Focussing Cloth, a black cloth used for covering over the head and back portion of the camera to exclude all extraneous light.
1853in Jrnl. Photogr. Soc. I. No. 3. 39/2 The *Focusing glass. 1858T. 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. |