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Digital Photography : Lenses
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Aperture - Photoxels
http://www.photoxels.com/tutorial_aperture.html
Depth of Field - Photoxels
http://www.photoxels.com/tutorial_dof.html
Focal Length - Photoxels
http://www.photoxels.com/tutorial_focal_length.html
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Digital Photography Review
http://www.dpreview.com/learn/?/Glossary/Optical/Lenses_01.htm