CANON EF-M 55-200mm f/4.5-6.3 IS STM

Focus Mechanism

B4a (S24–S26) moves toward the image for near focus (¶0028); D23 grows and D26 shrinks by the same amount, and every other group keeps its infinity position. The patent prints infinity spacings only, at 56.60, 134.00 and 195.00 mm. The nine focus positions are calculated so that the closest reaches Canon's 1 m minimum focus distance (object to image): B4a then travels 1.18 mm at 56.6 mm and 7.29 mm at 195 mm, for 0.061× and 0.205×. The 30 intermediate zoom stations are also calculated: B1–B3 move linearly between the printed rows, and B4 shifts as one unit to hold infinity focus.

Optical Elements (17 physical)