It's another post about lenses today to clear up some confusion about the difference between Canon lenses labeled EF and those that are EF-S.
In the end, it all boils down to crop factor. While most Canon cameras have sensors that are smaller than 35mm film (also called APS-C sensors) there are a handful like the Canon EOS 5D Mark II with full frame sensors.
Canon's EF lenses can be used on BOTH types of cameras: full frame or cropped frame. EF-S lenses are optimized for crop frame sensors ONLY so they won't work well on full frame DSLR cameras.
When making a Canon lens purchase, you have to ask this question: "in the future, will I ever want to upgrade to a Canon full frame camera?"
If the answer is "no" then get whatever lens you like: either EF or EF-S will work fine. However, if the answer is "yes" then you should only consider EF lenses. They will be compatible with your current crop frame camera and will also work if you ever upgrade to full frame in the future.
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