Focus

Focus | Depth of Field | Focus Ring | Deep Focus | Shallow Focus | Rack Focus | Rack Focus 2 | Autofocus

Focus

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Depth of Field

"Depth of field" refers to the part of the image that is in focus along the z-axis.
	Z-Axis - the imaginary line that extends from the lens of the camera through the fore/mid/background.
To adjust the focus of a shot you must: 1. Chose the appropriate Lens/Focal Length- Wide or Narrow 2. Adjust the distance between camera and objects and 3. Adjust the exposure settings/ the amount of light.

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The Focus Ring

The focus ring sets distance to plane of sharpest focus- included background, mid and foreground.
	The numbers on the ring represent the distance to the focused object.

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Deep Focus

Deep Focus: when all in shot is clear
	- Uses a wide angle zoom position - Shows foreground, midground and background of the shot in focus - Used in actions sequences

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Shallow/ Selective Focus- only has part of an image in focus- foreground, midground or background.

	- Use narrow angle zoom position - Creates blurry background and clear foreground - To create this you’ll need to put distance between objects and camera when setting up your shot

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Rack Focus

-A technique used to shift focus in a shot. -Both subjects must be lined up along the z-axis. -Use a narrow zoom position when setting up the shot. -Twist focus ring while filming to shift focus.

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Rack Focus Example

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Autofocus

- Camera continually shifts focus to central object. - Can be problematic when there are several objects in the scene. - Looks like “Bouncing Focus” - Fix by setting focus “manually”with focus ring.