Canon 70-200 f4 IS - Quality Problem with Focus Module

Started Dec 5, 2012 | Discussions thread
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Digital Ant
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Canon 70-200 f4 IS - Quality Problem with Focus Module
Dec 5, 2012

The canon 70-200 f4 IS lens is an excellent lens. However, recenlty there is a known problem with the quality of the focus module. The problem exists even for new purchased copy.

The lens has no problem to focus when the lens is in horizontal position. However, if your try to focus in the vertical position, there may be a problem.

It is very easy to verify if your copy has the problem.

1) put your lens in horizontal position.

a) watch the distance marking while turning the manual focus ring

b) there should be no problem when focusing from 1.2m to infinity and from infinity to 1.2m

2) now try to put your lens in vertical position, i.e. pointing the lens to the sky

a) there should be no problem when focusing from 1.2m to infinity

b) however, there may be problem when focusing from infinity to 1.2m

c) you may have to turn the focus ring quick to locate the problem

d) somewhere between infinity to 1.2m, there are a couple of distances that the distance marking will stop moving while you are turning the focus ring.

There are already quite a no. users returning the lens to Canon for repair. If your lens is still under warranty, you are lucky! Otherwise you have to pay a fortune to replace the focus module including the usm!!!

I think Canon should recall the batch of lens that have this problem for free repair.

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