Ask a Question

Using the Infinity Compensation Mark on the EF 400mm f/4 DO IS USM lens

Article ID: ART174659 | Date published: 06/03/2019 | Date last updated: 06/03/2019
 

Description

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  mark is aligned with the distance index.

Solution

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  mark is aligned with the distance index.
 
For accurate focusing in MF on subjects at infinity distance, look through the viewfinder while rotating the focusing ring.

Rate this Article
Was this article helpful?
Yes, This document is helpful
No, This document needs a clearer explanation
 
Please provide your comments