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Most headshots are printed as a 6x9 on an 8x10 with a border. If you select a bleed or strip style headshot, 2 inches will be cropped off the longest side of your image. This is because a 2:3 aspect ratio photo will have a size of 8x12 inches.
The standard or normal focal length that gives a similar field of view as that of the human eye is between 45-55mm depending on who you ask. On an APS-C sensor the equivalent range would be range would 28-34mm. If you are looking for a Canon Lens two reasonably priced prime lenses are: 1  EF 28mm f/2.8. 2  EF 35mm f/2.