Facial distortion of various focal lengths for headshots: Nikon SLR Lens Talk Forum: Digital Photography Review
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Understanding focal length: what is it and how it can vastly improve your photos | Photography lessons, Photography tutorials, Photography techniques
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LENSES The specs: focal length maximum aperture “long lenses, short lenses fast lenses, slow lenses” Fixed focal length (prime) or zoom. - ppt download
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Confused with scope focal length - what am I missing? - Beginners Forum (No astrophotography) - Cloudy Nights
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