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日期:2024-08-23
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....
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日期:2024-08-17
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...