Canon EF 17-40 mm f/ 4 L USM Lens 部件

ENG-3

Distance scale (

→ 6)

Focus mode switch (

→ 5)

Lens mount index (

→ 4)

Contacts (

→ 4)

Hood mount (

→ 7)

Focusing ring (

→ 5)

Gelatin filter holder (

→ 8)

Filter mounting
thread (

→ 7)

Zoom ring (

→ 5)

For detailed information, reference page numbers are provided in parentheses (

→ **).