"Film History." History of Kodak. Kodak, 15 July 2002. Web. 15 Nov. 2014. http://www.kodak.com/ek/US/en/Our_Company/History_of_Kodak/Milestones_-_chronology/1878-1929.htm.

"Refraction and Diffraction." Refraction and Diffraction. University of Tennessee, 6 May 2004. Web. 15 Nov. 2014. http://csep10.phys.utk.edu/astr162/lect/light/ref-diff.html.

"Diffraction of Light: Light Bending around an Object." Diffraction of Light. University of Illinois, 1 Jan. 2012. Web. 15 Nov. 2014. http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/opt/mch/diff.rxml.

"DIGITAL CAMERA SENSORS." Understanding Digital Camera Sensors. Cambridge in Color, 4 Oct. 2014. Web. 16 Nov. 2014. .

"Understanding Camera Autofocus." Understanding Camera Autofocus. Cambridge in Color, 2014. Web. 16 Nov. 2014. .

Ross, Alan. "How Do Light Meters Work?" Alan Ross Photography. Alan Ross Photography, 17 Sept. 2012. Web. 16 Nov. 2014.

Spring, Kenneth. "Geometric Distortion Aberrations." Nikon Microscopy. Nikon, 8 June 2012. Web. 20 Nov. 2014. .

Davidson, Michael. "Common Optical Defects in Lens Systems (Aberrations)." Molecular Expressions. 4 Sept. 2003. Web. 20 Nov. 2014. .

Allen, Elizabeth. The Manual of Photography. 10th ed. Oxford: Elsevier/Focal, 2011. Print.