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I gotta make sure I get this right so as not to confuse.....

You cannot use it with the 7-14 mm lens or the 11-22 lens as focusing is impossible.

It can be used with the 14-54, but only at...

Here is my review of the EX 25.

Pros:

It is a VERY well made accessory.
It gives the ability to focus VERY close.
It adds negligible weight to the camera/lens when attached.
Nice storage...