The Sony a9 III has what is known as a global shutter and is the first of its kind. This is what that means and why it matters.
is, at least on paper. As is always the case with press events, and especially ones where hands-on time is limited, pre-production firmware is installed, and shooting opportunities are cultivated, you should consume pre-release content with grains of salt. Hypertension be damned.
Rolling shutter is felt acutely for video applications as well, although the focus of this article is primarily on photography. Another huge benefit of a global shutter is the elimination of flickering and banding. With flickering lights, which are very common in a wide range of situations including at sporting venues, a long-time issue is that a light flickers at different frequencies within a single frame, which can wreak havoc on a progressive-scan sensor. With the a9 III, the entire image area is exposed at once, so whatever the state of light is at a given time is what will be exposed.
The sensor needs the processor, which needs chips, transistors, and memory. These hardware components not only require software, but they also must be small and thermally efficient enough to operate within a camera that offers photographers and videographers specific functions and features. Thus far, global shutter sensors have delivered narrower dynamic range and different ISO performance, all else equal. While RAW image files from the a9 III cannot be processed yet, so substantive image quality analysis is at this point impossible, there are some things that are already known.
The a9 III’s native ISO also peaks at 25,600, which is half of the a9 II’s maximum native ISO. Admittedly, it’s easy to wonder how frequently the camera’s insanely fast shutter speed will actually be worth using — or if it is usable at all. However, that is, at this juncture, an unanswerable query.
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