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What would happen if I mount an EF lens to my Canon 400d?
What would happen if I mount an EF lens to my Canon 400d? Lens Mount Also I heard that (for example) if I mount a 100-400mm EF USM IS lens to a DSLR such as my 400d, the effective focal length would be 160-640mm, so that means that the image will be cropped more than the actual focal length right?
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