Assertion: lens's diaphragm | /r/HasProperty | electromagnetic
Facets:
Source sentences:
text: When Canon introduced its EOS line of cameras in 1987, the EF lenses incorporated electromagnetic diaphragms, eliminating the need for a mechanical linkage between the camera and the diaphragm.
text: E-type Nikkor lenses use an electromagnetic diaphragm for more accurate and consistent control over the aperture diaphragm when using automatic exposure during continuous shooting, such as when recording video or shooting at high frame rates.