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In optics, a circle of confusion (CoC) is an optical spot caused by a cone of light rays from a lens not coming to a perfect focus when imaging a point source. It is also known as disk of confusion, circle of indistinctness, blur circle, or blur spot.
Jun 20, 2021 · The circle of confusion is the measurement of where a point of light grows to a circle you can see in the final image. Also called the zone of confusion, it’s measured in fractions of a millimeter. The circle of confusion is what defines what’s in or out of focus. This number is also what calculates depth of field.
The Circle of Confusion occurs when a point of light from an image enters the camera through the lens and lands on the sensor at the back of the camera. It’s a measurement of a point of light that falls on the focal plane (i.e. camera sensor) that’s often referred to as the focal point .
Would you like to understand Circle of Confusion (CoC)? and how it changes with sensor size, maximum photo print dimension, photo viewing distance and viewer’s visual acuity. This Circle of Confusion calculator will work out the numbers for you.
Jun 7, 2021 · Photographers refer to the measurement of such optical blurs as the circle of confusion. When you enlarge a photograph beyond a certain size, you may notice that parts of the photo that once appeared sharp now seem blurry.
Jul 5, 2022 · A single point on a subject is only registered as a point on the camera’s sensor if the lens is precisely focused at the right distance. Otherwise it will actually be recorded as a circle (known as a ‘circle of confusion’). Use this diagram to help you when it comes to the circles of confusion.
Feb 13, 2024 · When set to hyperfocal distance the vision of what is in an image and its sharpness is measured by the circle of confusion. When a subject is far enough away from the camera the light will converge differently in the lens. In this case, the background will appear to have more sharpness.
