diopter

diopter englannista suomeksi

1. diopteri

0. Substantiivi

1. dioptria, diopteri

2. teodoliitti

diopter englanniksi

1. A unit of measure of the power of a lens or mirror, equal to the reciprocal of its length in meters. Myopia is diagnosed and measured in diopters.

2. The dioptre adjustment mechanism of a pair of binoculars or of a camera viewfinder.

3. A lens element attached to the front of a photographic lens to shorten the lens's minimum focus distance; also called a "close-up filter".

4. Any lens system, such as a telescope.

5. A theodolite or similar surveyor’s angle measuring device.

6. An alidade.

7. A surgical speculum.

8. An instrument for drawing the skull by projections.