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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.
Wide-angle lenses for 35 mm format. For a full-frame 35 mm camera with a 36 mm by 24 mm format, the diagonal measures 43.3 mm and by custom, the normal lens adopted by most manufacturers is 50 mm. Also by custom, a lens of focal length 35 mm or less is considered wide-angle.