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![lens - The Worlds of David Darling]()
www.daviddarling.infoLight passing through a lens is actually bent at each surface. However, in simple ray diagrams it is possible to disregard this and draw all the bending at a single line (the principal plane) running down the center of the lens.瀏覽：1054 -
![Should I buy a 17-40 L lens for my 70d?]()
uk.answers.yahoo.comThe 17-40mm L lens is a full frame lens. It is designated EF and not EF-S. EF-S is designed for crop body Canons. The 17-40 will have focal length of 27.2-64 because of the x1.6 crop factor on your 70d. It tested only above average Photozone.de - its like瀏覽：438
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瀏覽：1051
日期：2025-07-10
Light passing through a lens is actually bent at each surface. However, in simple ray diagrams it is possible to disregard this and draw all the bending at a single line (the principal plane) running down the center of the lens....
瀏覽：1069
日期：2025-07-07
The 17-40mm L lens is a full frame lens. It is designated EF and not EF-S. EF-S is designed for crop body Canons. The 17-40 will have focal length of 27.2-64 because of the x1.6 crop factor on your 70d. It tested only above average Photozone.de - its like...
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