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Lowepro Camera Repairs and Owner Manuals
Note: These angles correspond to a sensor or film size of 35 mm classic movie (36 mm x 24 mm) and distance to the subject photographed a not too low (to 1 m in 80 mm focal angle is 28 ° falling rapidly the closer we are to reason).The objectives are objectives very light reflectors, very small relative to its focal length and very cheap. They are built with mirror systems similar to telescopes. The inconveniences have a fixed diaphragm opening, there are bright, there are aberrations, and the bokeh is poor quality.