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To stack or not to stack

Started Sep 26, 2019 | Polls thread
Pixel Pooper Veteran Member • Posts: 3,978
Re: Larger DOF with larger sensors (not a typo)

mawyatt2002 wrote:

Pixel Pooper wrote:

mawyatt2002 wrote:

Just a note, don't think the Circle of Confusion is affected by the angle, it's just an arbitrary level of focus acceptance (and confusion) that folks have decided to use. In Fig 17 the CoC is constant but then cone angle is quite different, and thus the DoF is much different.

The circle of confusion is the blur circle created by the cone of light. The wider the angle of the cone, the larger the circle of confusion at any given distance from the focal plane.

My point being that CoC is a value (~0.03mm for 36mm FF, ~0.018mm for APC ) determined by other factors, the cone creates a blur circle the CoC defines the acceptable limit of such.

The circle of confusion is the blur circle created by the cone of light. The value you are taking about is the maximum permissable circle of confusion which is the diameter of the largest COC that is still perceived as a point in the displayed image.

From Wiki, "In photography, the circle of confusion (CoC) is used to determine the depth of field, the part of an image that is acceptably sharp. A standard value of CoC is often associated with each image format, but the most appropriate value depends on visual acuity, viewing conditions, and the amount of enlargement. Usages in context include maximum permissible circle of confusion, circle of confusion diameter limit, and the circle of confusion criterion."

Best,

The first paragraph of that Wikipedia page says:

"In optics, a circle of confusion 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."

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