Characteristics[ edit ] A photograph taken with a zoom lens, whose focal length was varied during the course of the exposure Zoom lenses are often described by the ratio of their longest to shortest focal lengths. Quality degradation is less perceptible when recording moving images at low resolution, which is why professional video and TV lenses are able to feature high zoom ratios. Digital photography can also accommodate algorithms that compensate for optical flaws, both within in-camera processors and post-production software. Some photographic zoom lenses are long-focus lenses , with focal lengths longer than a normal lens , some are wide-angle lenses wider than normal , and others cover a range from wide-angle to long-focus. Lenses in the latter group of zoom lenses, sometimes referred to as "normal" zooms[ citation needed ], have displaced the fixed focal length lens as the popular one-lens selection on many contemporary cameras.
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Colorectal cancer is a disease of old age: It typically originates in the secretory cells lining the gut , and risk factors include diets low in vegetable fibre and high in fat. If a younger person gets such a cancer, it is often associated with hereditary syndromes like Peutz-Jegher's , hereditary nonpolyposis colorectal cancer or familial adenomatous polyposis. A constant feeling of having to go to the toilet or anemia might also point to this kind of cancer. Removal of a section of the colon is necessary for treatment, with or without chemotherapy.
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Postmenopausal woman with a breast mass - colloid mucinous carcinoma of the breast Case 8: Two year old boy with multiple skull masses - Langerhans cell histiocytosis Case Elderly man with a fixed neck mass - adenoid cystic carcinoma of larynx extending to thyroid gland Case 9:
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