Canon EF-S55-250mm f/4-5.6 IS STM Instructions Manual page 12

8 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: 0.23x - 1.04x
● ●
Close-up Lens 500D: 0.11x - 0.66x
● ●
MF mode is recommended for accurate focusing.
ENG-11