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Canon EF 40mm f/2.8 STM Product Advisory

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Canon Rumors:
To Users of the EF40mm f/2.8 STM Interchangeable Lens for Canon Digital SLR Cameras
Thank you for using Canon products. It has been confirmed that the autofocusing function of the EF40mm f/2.8 STM lens, which was released in June 2012, may not operate correctly. The details of this phenomenon are described below. Affected Product
EF40mm f/2.8 STM Phenomenon
If pressure is applied to the lens barrel while the lens is mounted to the camera (pressure can be applied even while attaching the lens cap or while carrying the camera with the lens attached in a bag), the autofocusing function of the lens may stop working. *This phenomenon does not occur during normal shooting. *This phenomenon does not result in a malfunction of the lens. Workaround
When the above phenomenon occurs, detach and reattach the lens, or remove and reinsert the camera battery to restore the operations. Market Support
The firmware to address this phenomenon will be available for download in late August, 2012. Once this firmware is ready, we will make an announcement on our Web site. cr

preppyak:
So...putting your lens cap on might cause it to not be able to AF without taking the lens off and on?

Yeah, that's something that shouldn't have made it past QC testing.

trulandphoto:

--- Quote from: preppyak on August 08, 2012, 12:05:58 PM ---So...putting your lens cap on might cause it to not be able to AF without taking the lens off and on?

Yeah, that's something that shouldn't have made it past QC testing.

--- End quote ---

True. It's happened to me putting the lens cap back on. It's not hard to get in the practice of retracting the lens first, though. And you don't have to remove the lens just rotate it a bit and re lock it.

I stil love the lens.

Jarques:
Yeah I've had this happen to me multiple times, I usually detach and reattach the lens to fix it. Very annoying.

Still a fantastic lens though.

Dylan777:

This is why I patiencly wait for GOOD copy of new 24-70 V2.

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