Instruction manual for EF1.4x III, EF2x III teleconverter, including product features, usage methods, precautions, etc.
This manual explains how to safely use Canon's EF 1.4X and EF 2X teleconverters. It includes important safety precautions such as avoiding direct sunlight, preventing high‑temperature exposure, and proper handling to avoid damage.
The guide details assembly and disassembly procedures, explains the change in maximum aperture when the teleconverters are attached, and lists the main technical specifications such as lens construction, dimensions, weight, and protective coating. This manual is written in Chinese.
| Assembly method | Canon EF mount (fully electronic control) |
|---|---|
| Lens construction | EF1.4X: 3 groups 7 elements; EF2X: 5 groups 9 elements |
| Dimensions (EF1.4X) | 72.0 mm × 27.2 mm |
| Dimensions (EF2X) | 72.0 mm × 52.7 mm |
| Weight (EF1.4X) | ≈225 g |
| Weight (EF2X) | ≈325 g |
| Protective coating | LP811 |
No, they can only be used with the EOS‑1V; using them with other film EOS cameras may cause abnormal operation.
When using the EF 1.4X teleconverter, the maximum aperture is reduced by one stop.
First attach the teleconverter to the lens, then mount the lens (with teleconverter) onto the camera; disassembly is the reverse order.