query: Understanding Lens Viewing Angle and Focal Length Relationship
positive_passages.docid: 80219
positive_passages.text: What is the relationship between field of view and focal length for fisheye?
negative_passages.docid: 40309
negative_passages.text: Glass acting as a lens?
negative_passages.docid: 60038
negative_passages.text: How do depth of field and the circle of confusion relate to pixel size on the sensor?
negative_passages.docid: 8552
negative_passages.text: Which focal-length lens is usually used for portrait photography, and why?
negative_passages.docid: 38537
negative_passages.text: What is the relationship between ISO, aperture, and shutter speed?
negative_passages.docid: 11996
negative_passages.text: How do I find the right size of filters for a lens?
negative_passages.docid: 93222
negative_passages.text: How does sensor size affect the brightness of an image given the same field of view and aperture?
negative_passages.docid: 126293
negative_passages.text: Relationship between slit size and wavelength in diffraction
negative_passages.docid: 62830
negative_passages.text: Can I calculate sensor size from pixel dimensions and number (to find angle of view)?
negative_passages.docid: 140954
negative_passages.text: what's the relation between sensor size and image quality (noise, dynamic range)?
negative_passages.docid: 21744
negative_passages.text: Focal length of an ellipse and related results
negative_passages.docid: 11197
negative_passages.text: How do I convert lens focal length (mm) to x-times optical zoom?
negative_passages.docid: 57844
negative_passages.text: What lens focal length most closely resembles the perspective of the human eye?
negative_passages.docid: 145622
negative_passages.text: How do constant aperture zoom lenses work?
negative_passages.docid: 52368
negative_passages.text: Does the diameter of the aperture increase with increases in the focal length with constant F-number(F-stops)?
negative_passages.docid: 135149
negative_passages.text: How do camera body motors compare to in-lens motors for focusing?
negative_passages.docid: 37422
negative_passages.text: Since it's not "focal length", what is the term for the distance at which things are in focus?