Comparison of Canon EF 400mm ƒ/4 DO IS II USM and Canon EF 200-400mm f/4L IS USM Extender 1.4X [S]ave
| Attribute |  Canon EF 400mm ƒ/4 DO IS II USM × |  Canon EF 200-400mm f/4L IS USM Extender 1.4X × |
|---|---|---|
| Aperture (f) | 4.00 - 32.00 | 4.00 - 32.00 |
| Filter Size (mm) | 52 | 52 |
| Notes | Image Stabilization (4 stops); Weather-sealed construction | Built-in 1.4x extender (8 elements in 4 groups) switches to 280-560mm f/5.6 lens with 0.21x / 1.48 magnification ratio; 4-stop Image Stabilization |
| Closest Focus (m) | 3.3 | 2 |
| Magnification Ratio (x) | 0.13 | 0.15 |
| Diameter (mm) | 128 | 128 |
| Type | Telephoto Prime | Telephoto Zoom |
| APS Equivalent | 640mm | 320 - 640mm |
| Diaphragm Blades | 9 | 9 |
| Image Circle | 35mm | 35mm |
| Focal Length (mm) | 400.00 | 200.00 - 400.00 |
| Brand | Canon | Canon |
| Name | Canon EF 400mm ƒ/4 DO IS II USM | Canon EF 200-400mm f/4L IS USM Extender 1.4X |
| Weight (g) | 2100 | 3620 |
| Diaphragm Blades Type | rounded | circular |
| Lens Construction | 18 elements in 12 groups, including 1 aspheric and 1 UD element; Newly-developed gapless dual-layer diffractive optical (DO) elements | 25 elements in 20 groups (incl. 1 rear filter); one fluorite and four UD lens elements |
| Diagonal Angle of View (degree) | 6.20 | 6.20 - 12.00 |
| Length (mm) | 233 | 366 |
| Zoom System | - | Rotating |
| Focus Details | Inner focusing; full-time manual focus and ring USM | Inner focusing; Full-time manual focus and ring USM; Ring USM, High-speed CPU and optimized AF algorithms; Power Focus mode; Focus Limiter |
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