Assertion: mirrorless camera | /r/CapableOf | use contrast detection
Facets:
value: to measure the contrast
type: PURPOSE
Source sentences:
text: DSLR cameras use what is called phase detection to focus on a subject, while mirrorless cameras use contrast detection.
text: Mirrorless cameras, on the other hand, use contrast detection to measure the contrast between pixels on the sensor until it detects enough contrast to find that the image is in focus.