Comparison of Canon EF 400mm f/2.8L IS USM and Vivitar 1.4X Series 1 AF [S]ave
| Attribute |  Canon EF 400mm f/2.8L IS USM × |  Vivitar 1.4X Series 1 AF × |
|---|---|---|
| Name | Canon EF 400mm f/2.8L IS USM | Vivitar 1.4X Series 1 AF |
| Image Circle | 35mm | 35mm |
| Brand | Canon | Vivitar |
| APS Equivalent | 640mm | - |
| Focal Length (mm) | 400.00 | - |
| Effective Reduction in Aperture | - | 1 f-stop |
| Diameter (mm) | 163 | - |
| Closest Focus (m) | 3 | - |
| Focus Details | Inner focusing; full-time manual focus and USM | - |
| Filter Size (mm) | 52 | - |
| Magnification Ratio (x) | 0.15 | 1.4 |
| Length (mm) | 349 | - |
| Aperture (f) | 2.80 - 32.00 | - |
| Diagonal Angle of View (degree) | 6.20 | - |
| Weight (g) | 5370 | 181 |
| Lens Construction | 17 elements in 13 groups, including 1 flourite and 2 UD elements | 4 elements in 4 groups; Multicoated Optical Glass |
| Type | Telephoto Prime | Teleconverter |
| Diaphragm Blades | 8 | - |
| Focal Length Multiplier | - | 1.4X that of the master lens |
| Notes | Image Stabilization | Available AF Mounts: Canon EF, Nikon F, Sony Alpha |
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