/ Photography Optics Question! What is the technical term for this ………………………………….?

the distance between the nearest and farthest point of focus in an image in three dimensions:

is the focal plane, or depth of field, which is linked to the opening. More openness (Lower f-stop number), plus the depth of field / area focal plane (less than three-dimensional space is developed, which will have a foreground and background be blurred). Small openings (more f-stop numbers) have a larger three areas are developed. Hope this helps.

Vignetting in photography and optics ..or fiction!

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