| 单词 | field lens |
| 释义 | > as lemmasfield lens field lens n. Optics (in a telescope or microscope) the lens of a compound eyepiece which is nearest to the objective; = field glass n. 2; contrasted with eye lens n. (a) at eye n.1 Compounds 4. ΘΚΠ the world > the universe > cosmology > science of observation > astronomical instruments > observational instruments > [noun] > telescope > part of rete1665 field lens1817 hour-circle1837 seeker1892 1817 A. Rees Cycl. (1819) XXXV. at Telescope Fig. 5 gives the arrangement of the lenses in a terrestrial achromatic telescope with a triple object-glass; in which A is the object-glass, B the eye-lens, and C the amplifier, or field-lens of the eye-piece BC. 1907 E. T. Whitaker Theory of Optical Instruments iii. 62 The resulting chromatic error being..removed by substituting achromatic combinations for the simple field-lens and eye-lens. 2005 R. B. Thompson & B. F. Thompson Astron. Hacks iv. 302 Remove the barrel from the Plössl eyepiece to reveal the field lens and field stop. < as lemmas |
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