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Focus BallBoxing

Updated November 2014 with latest Canon and Nikon DLSR cameras. These are still by far the most popular DSLR cameras used in astronomy, should anyone be interested I'll add the Sony and Pentax models.

To generate a chart of focal length vs fov enter the starting (minimum) focal length and the ending (maximum) focal length. Choose your camera type and click generate. Optionally you can set the fl increment step and output display format. A new browser window will be opened with the results.

To find the field of view (fov) for a camera lens or telescope enter the focal length (fl) and click the calculate button. You can select or convert the fov result format in either degrees-minutes-seconds format or decimal degrees below.