query: Depth of field and aperture size
positive_passages.docid: 12506
positive_passages.text: What exactly determines depth of field?
negative_passages.docid: 10570
negative_passages.text: Does sensor size affect lens distortion?
negative_passages.docid: 6598
negative_passages.text: How to calculate the correct focal length needed for a subject of a given size and distance?
negative_passages.docid: 94271
negative_passages.text: What is the reference plane used when the minimum focus distance is measured?
negative_passages.docid: 59156
negative_passages.text: What lens is needed to change the minimal focus distance length of my camera?
negative_passages.docid: 49187
negative_passages.text: What is focal length and how does it affect my photos?
negative_passages.docid: 14182
negative_passages.text: How to ensure sharp focus when shooting with an open aperture?
negative_passages.docid: 148161
negative_passages.text: Sharpness and bokeh comparison of Nikon 50mm f/1.2, f/1.4G and f/1.8G
negative_passages.docid: 6544
negative_passages.text: How do zoom lenses restrict their widest aperture at the telephoto end?
negative_passages.docid: 105343
negative_passages.text: Interference at the focus of a convex lens or a concave mirror
negative_passages.docid: 21744
negative_passages.text: Focal length of an ellipse and related results
negative_passages.docid: 1032
negative_passages.text: What is the reference point that the focal length of a lens is calculated from?
negative_passages.docid: 83556
negative_passages.text: What are the theoretical minimum and maximum apertures?
negative_passages.docid: 71754
negative_passages.text: Why do two zoom lenses set to 200mm on the same camera produce different fields of view?
negative_passages.docid: 12994
negative_passages.text: Is it physically possible to build a long zoom (17-300 mm for example) at an aperture value of around 1.4 or 1.2?
negative_passages.docid: 58821
negative_passages.text: How can the aperture value written in Exif be larger than the nominal limit of the lens?
negative_passages.docid: 4
negative_passages.text: What is the best way to improve Aperture 3 peformance on an iMac?