Infinity Compensation Mark
To compensate for shifting of the infinity focus point that results from changes in temperature, there is a margin at the infinity (∞) position.
The infinity position at normal temperature is the point at which the vertical line of the distance scale
![](/library/CANON/CITS_TECH_SUPPORT/Camera/Lenses/EF%20400mm%20F2.8L%20IS%20III%20USM/mark.png)
mark is aligned with the distance index.
![](/library/CANON/CITS_TECH_SUPPORT/Camera/Lenses/EF%20400mm%20F2.8L%20IS%20III%20USM/warning.png) |
- For accurate manual focusing of subjects at infinity, look through the viewfinder or look at the magnified image* on the LCD screen while rotating the focusing ring.
- * For cameras with Live View shooting capability.
|