June 2019
Beginner
156 pages
4h 59m
English
Content preview from 50 Things Photographers Need to Know About FocusBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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12. PHASE DETECTION
DSLR CAMERAS USE a phase detection sensor as their primary focusing system. This system uses a beam splitter to compare two rays of light from different parts of the lens. Phase detection focusing has been the standard for SLR-style cameras since the mid-1980s, and has the principal benefit of being very fast in operation (Figure 12.1).
When light enters a DSLR, the light is reflected off a mirror and up to a prism system so the photographer can see what the camera is pointed at. The primary mirror has a translucent section in the middle that allows a small amount of light to pass directly through it. The light that passes ...
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