query: Can a lens exist with an f-stop of less than 1?
positive_passages.docid: 83556
positive_passages.text: What are the theoretical minimum and maximum apertures?
negative_passages.docid: 10570
negative_passages.text: Does sensor size affect lens distortion?
negative_passages.docid: 18161
negative_passages.text: How would one use filters with the "bulb"-like shape front element lenses?
negative_passages.docid: 86838
negative_passages.text: What do the red values mean on the distance scale of a lens?
negative_passages.docid: 137089
negative_passages.text: Front element shattered, can I have my lens repaired?
negative_passages.docid: 76957
negative_passages.text: Can I damage the focus system by turning the focus ring when the lens isn't mounted?
negative_passages.docid: 59156
negative_passages.text: What lens is needed to change the minimal focus distance length of my camera?
negative_passages.docid: 53448
negative_passages.text: Do bigger focal lengths capture more light?
negative_passages.docid: 22605
negative_passages.text: Is image stabilization a necessary feature for wide angle lenses?
negative_passages.docid: 62759
negative_passages.text: Why am I allowed to turn my focusing ring beyond infinity?
negative_passages.docid: 96444
negative_passages.text: Will any non-AF lens work on a Nikon camera with built in AF already in the camera body?
negative_passages.docid: 11081
negative_passages.text: Can relative permittivity be less than 1?
negative_passages.docid: 18159
negative_passages.text: Is it possible to use the lenses from a Canon Xl1 on a modern DSLR?
negative_passages.docid: 83545
negative_passages.text: What configuration would limit my DSLR's shutter speed to 1/200?
negative_passages.docid: 41048
negative_passages.text: If I have a 18-55mm lens, is there a point in buying a 35mm prime lens?
negative_passages.docid: 141771
negative_passages.text: What is the benefit of a wide-aperture lens if you stop it down?
negative_passages.docid: 3867
negative_passages.text: is it normal to get significant lens flare with a 50mm f/1.8 prime lens?