| 单词 | to diaphragm down |
| 释义 | > as lemmasto diaphragm down transitive. To fit or act upon with a diaphragm. to diaphragm down, in Optics: to reduce the field of vision of (a lens, etc.) by means of an opaque diaphragm with a central aperture (see diaphragm n. 4a). ΘΚΠ the world > physical sensation > sight and vision > optical instruments > lens > [verb (transitive)] > reduce field to diaphragm down1879 1879 H. Grubb in Proc. Royal Dubl. Soc. 181 Even after shutting one eye and diaphragming the other down. 1894 Brit. Jrnl. Photogr. 41 1 If both [lenses] are diaphragmed down to the same aperture. < as lemmas |
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