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Lenses / Angle of view calculations
« on: October 05, 2012, 12:51:23 PM »
Maybe I don't fully understand all of the specifications that are described when looking at a lens but I would like to better understand the angle of view specification a little more clearly. When you look at say a 300mm prime lens on the Canon website, the diagonal angle of view is said to be 8° 15'. I am fairly certain this is for a full frame sensor as the angle of view (I think) is dependent upon sensor size. If this is so, how would I use this information to determine the distance needed to frame a 6ft tall person within a crop sensor (portrait or landscape)? That is, if I wanted to shoot a football game and would like to shoot from the 50yd line, how could I calculate the focus distance that a 300mm lens would "reach" for a full body shot without much cropping? I understand it should be fairly simple geometry but I am not 100% sure as to how to approach it. Anyone with some knowledge?
As the above paragraph is probably convoluted, I am trying to figure out what focal length lens I would need for specific sports of I know my distance form the athletes. So if I am at the 50yd line, would a player at the 20yd line take up the full frame?
As the above paragraph is probably convoluted, I am trying to figure out what focal length lens I would need for specific sports of I know my distance form the athletes. So if I am at the 50yd line, would a player at the 20yd line take up the full frame?