cf723436__고화질_그림_지침___Wikimedia_Commons__분류
[공통적인 문제점들] Improper focus Undefined focus Insufficient depth of field Too deep depth of field [규정] Every important object on the picture should be sharp, considering the idea of the image. The overall image should have clearly defined focus, for example, the main subject is in focus and the foreground and background are out of focus, or else, the whole scene is in focus. [토의] Depth of field is often low intentionally. If in doubt, ask. "Depth of field" (DOF) refers to the area in focus in front of and beyond main subject. Depth of field is chosen according to the specific needs of every picture. Large or small DOF can add to or detract from the quality of the image. Low depth of field can be used to bring attention to the main subject, separating it from the general environment. High depth of field can be used to emphasize space. At a given subject distance, short focal length lenses (wide angles) yield larger DOF than longer focal length lenses (telephotos). Narrow apertures (high f-numbers) yield larger DOF than wide apertures (low f-numbers). [예시자료] bad problem with focus correct focus and depth of field shallow depth of field serving a purpose [분류] 
Focus and depth of field
Commons:고화질 그림 지침 - Wikimedia Commons