Canon EF 70-300mm f4-5.6 IS USM - Manual (Page 12)

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10. Close-up Lenses
(Sold separately)
Attaching a 250D or 500D (58mm) Close-up
Lens enables close-up photography.
The magnification will be as follows:
¡ Close-up Lens 250D:
Can be used at the 70mm end (magnification
0.29x - 0.38x)
¡ Close-up Lens 500D:
Can be used (magnification 0.14x - 0.90x)
Manual focusing is recommended for accurate
focusing.