Learn about a few technical points about extenders, the different versions that have appeared through the years and their compatibility with specific Canon EF lenses.
Further expand on your lens' telephoto power by using an EF 1.4x III or EF 2x III Extenders.
A great accessory to double the effective focal length of whatever lens you're using, without changing its minimum focus distance – so, for example, it can be a tremendous asset to nature shooters photographing small subjects such as birds.
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