This is the user manual for Canon EF1.4 ⅩⅡ and EF2 ⅩⅡ teleconverters, which introduces the features and characteristics of the teleconverters, the usage methods and precautions.
The manual provides safety warnings, emphasizing that looking at the sun through the teleconverter can cause permanent eye damage and that leaving the lens uncovered in sunlight may cause fire. It also describes the correct assembly order – attach the teleconverter to the lens first, then mount the lens on the camera – and the reverse steps for disassembly.
Operational notes cover the reduction in maximum aperture (1 stop for EF1.4X, 2 stops for EF2 X) with automatic exposure compensation by the camera, slower autofocus, and the need for exposure compensation when using EOS5. The specifications section lists dimensions, weight, lens construction, and protective coating details, while a hazardous‑substance table shows compliance with environmental standards. This manual is written in Chinese.
| Assembly method | Canon EF electronic control |
|---|---|
| Lens construction (EF1.4X) | Four groups, five elements |
| Lens construction (EF2 X) | Five groups, seven elements |
| Dimensions (EF1.4X) | 72.8 mm × 27.2 mm |
| Dimensions (EF2 X) | 71.8 mm × 57.9 mm |
| Weight (EF1.4X) | 220 g |
| Weight (EF2 X) | 265 g |
| Protective coating | LP811 |
No – looking at the sun or other strong light sources through a teleconverter can cause permanent eye damage.
First attach the teleconverter to the lens, then mount the lens on the camera; to disassemble, reverse the steps.