If you want to have some fun other than just taking photo...
Here is your chance to understand and create a lens of your ownWinLens Download:
http://www.winlens.de/index.php?id=25
WinLens3D Basic - lens design software
http://www.opticalsoftware.net/index.php/how_to/lens_design_software/winlens3dbasic
Lens Design Fundamentals Textbook:
http://www.amazon.com/Lens-Design-Fundamentals-Second-Edition/dp/012374301X
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What about lens construction influences bokeh?
http://photo.stackexchange.com/questions/22154/what-about-lens-construction-influences-bokeh
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