query: Is focal length measured relative to the sensor or the lens?
positive_passages.docid: 11001
positive_passages.text: What is "angle of view" in photography?
negative_passages.docid: 5648
negative_passages.text: Will metering from a DSLR apply to a film SLR?
negative_passages.docid: 11996
negative_passages.text: How do I find the right size of filters for a lens?
negative_passages.docid: 12506
negative_passages.text: What exactly determines depth of field?
negative_passages.docid: 133641
negative_passages.text: How do DSLRs figure out what aperture to select in P mode?
negative_passages.docid: 33211
negative_passages.text: How do I diagnose the source of focus problem in a camera?
negative_passages.docid: 150402
negative_passages.text: Is it normal for focal length to change while focusing?
negative_passages.docid: 87866
negative_passages.text: Tracking a shot with focal variation (zoom)
negative_passages.docid: 60848
negative_passages.text: Do megapixels matter with modern sensor technology?
negative_passages.docid: 113839
negative_passages.text: How can I visualize or simulate the effect of different focal lengths?
negative_passages.docid: 142541
negative_passages.text: How does photography (as opposed to physics) define "focal-plane"?
negative_passages.docid: 59156
negative_passages.text: What lens is needed to change the minimal focus distance length of my camera?
negative_passages.docid: 158181
negative_passages.text: How does the lens diameter influence photo quality?
negative_passages.docid: 152115
negative_passages.text: Can I convert binocular zoom to equivalent lens focal length?
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?
negative_passages.docid: 38712
negative_passages.text: Diffraction by a lens
negative_passages.docid: 90109
negative_passages.text: Are cropped images from a full-frame sensor equal quality to full APS-C images despite the lower resolution?