​Sony's Fast Hybrid AF: Merging Precision and Swiftness in Autofocus

Sony's Fast Hybrid AF (Autofocus) is a technology used in their FX9, FX6 & FX3 cameras (amongst others), to achieve quick and accurate focusing. It combines two types of autofocus methods: phase detection AF and contrast detection AF, in order to provide a balanced and efficient focusing system.

Note: A lens that supports Fast Hybrid auto focus is required. If a lens lacks the Fast Hybrid AF capability, it will default to using Contrast-detection AF.

Phase Detection AF (PDAF):

Phase detection involves splitting incoming light rays through the sensor or by utilizing dedicated phase detection pixels on the camera's image sensor. By comparing the *phase differences between the split light rays, the camera can determine the degree and direction of focus adjustment required.

* The phase refers to the difference in the timing of the light rays that strike the sensor in the PDAF system

Phase detection is generally faster than contrast detection, making it especially useful for tracking moving subjects, as it can quickly and accurately determine the focus point even as the subject moves. PDAF is also more accurate than contrast detection autofocus in low-light conditions.

Contrast Detection AF:

Contrast detection autofocus (AF) works by analysing the contrast between pixels on the camera's sensor. When the subject is in focus, the contrast between the pixels is highest. The camera then moves the lens back and forth until it finds the point of maximum contrast, indicating proper focus.

Contrast detection is very accurate but can be slower, especially in low-light conditions or when focusing on fast-moving subjects.

Hybrid Approach:

Sony's Fast Hybrid AF intelligently combines the benefits of both phase detection and contrast detection. It uses phase detection to quickly estimate the initial focus point, reducing the focus hunt that might occur with contrast detection alone. Once the initial focus point is determined, Hybrid AF switches to contrast detection AF to fine-tune the focus and ensure that it is as accurate as possible.

This allows Hybrid AF to achieve fast focus acquisition while still maintaining accurate focus, even when the subject is moving or the lighting conditions are changing.

Focus Points:

Sony's cameras often feature a wide array of phase detection points that cover a significant portion of the image sensor. This expansive coverage allows for effective subject tracking across the frame, but the number of points will differ across the range of cameras: FX9 (561 points) FX6 (627 points) FX3 (627 points).

In essence, Sony's Fast Hybrid AF utilizes the speed of phase detection and the precision of contrast detection to provide quick and accurate autofocus performance. This makes it particularly useful for capturing fast-moving subjects, tracking people or shooting in challenging lighting conditions. Keep in mind though that the specifics of this technology might vary across the different Sony camera models and firmware updates.

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