Key facts
- Brand
- Canon
- Model
- EF1
- Category
- Other Electronics
- Industry
- Electronics
- Documents
- 3
- Languages
- ZH
- Last added
- 2012-03-20
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Canon EF 1.4X & EF 2X Teleconverter User Manual
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.
Canon EF1 specifications
| 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 |
All Canon EF1 documents by type
Day-to-day operation, settings and troubleshooting. Start here if the product is already set up.
Questions answered in these manuals
Can the EF 1.4X and EF 2X teleconverters be used with any EOS film camera?
No, they can only be used with the EOS‑1V; using them with other film EOS cameras may cause abnormal operation.
How does the maximum aperture change when using the EF 1.4X teleconverter?
When using the EF 1.4X teleconverter, the maximum aperture is reduced by one stop.
Can the EF1.4X III and EF2X III teleconverters be used with film cameras other than EOS‑1V?
No, the teleconverters cannot be used with other film cameras; using them with non‑EOS‑1V film cameras may cause operation anomalies.
What safety precautions should be observed when using these teleconverters?
Do not look at the sun or strong light sources through a lens with the teleconverter attached, do not leave the camera exposed to sunlight without a lens cap, and avoid high temperatures that could damage the teleconverter.
Can I look at the sun through the teleconverter?
No – looking at the sun or other strong light sources through a teleconverter can cause permanent eye damage.
What is the correct way to assemble and disassemble the teleconverter?
First attach the teleconverter to the lens, then mount the lens on the camera; to disassemble, reverse the steps.