query: Where is the focal point of a camera lens?
positive_passages.docid: 142541
positive_passages.text: How does photography (as opposed to physics) define "focal-plane"?
negative_passages.docid: 20086
negative_passages.text: Why is the amount of light a lens lets in called the 'lens speed'?
negative_passages.docid: 50452
negative_passages.text: Did film photography have lens correction counterparts?
negative_passages.docid: 130570
negative_passages.text: Why can't my SLR autofocus on certain parts of a scene?
negative_passages.docid: 156969
negative_passages.text: How does autofocus work?
negative_passages.docid: 86838
negative_passages.text: What do the red values mean on the distance scale of a lens?
negative_passages.docid: 70445
negative_passages.text: What's the quickest, easiest way to point the camera somewhere in blender?
negative_passages.docid: 47999
negative_passages.text: How do you find out the "sweet spot" of a lens?
negative_passages.docid: 117618
negative_passages.text: How to geometrically prove the focal property of ellipse?
negative_passages.docid: 21744
negative_passages.text: Focal length of an ellipse and related results
negative_passages.docid: 8552
negative_passages.text: Which focal-length lens is usually used for portrait photography, and why?
negative_passages.docid: 149047
negative_passages.text: Ellipses given focus and two points
negative_passages.docid: 63434
negative_passages.text: Technically, why is the out of focus area blurred more when using a bigger aperture?
negative_passages.docid: 133641
negative_passages.text: How do DSLRs figure out what aperture to select in P mode?
negative_passages.docid: 73821
negative_passages.text: Understanding the coordinate system for ImageTake
negative_passages.docid: 126119
negative_passages.text: Focus in night photography
negative_passages.docid: 62759
negative_passages.text: Why am I allowed to turn my focusing ring beyond infinity?