Gear Talk > Lenses
EF 40mm STM Pancake Problem Acknowledged
dr croubie:
http://www.the-digital-picture.com/News/News-Post.aspx?News=2822
(I couldn't find the original thread about people saying they had a problem with it, so starting a new one).
Canon have acknowledged that there is a problem with this lens, I've had it too, where the AF just stops working occasionally.
They're blaming 'pressing the lens'. I know I haven't done it purposefully, but it could happen in my bag(s), and if it takes as little pressure as 'putting a lens cap on', then that's a design flaw.
Still, i'll do what it takes to fix it, it's otherwise a good lens.
My only concern is:
"The firmware to address this phenomenon will be available for download in late August, 2012."
This problem has only happened to me on my EOS 3, not the 7D. Are they talking about lens firmware or camera?
Mt Spokane Photography:
I tried to see if I had the issue, mounted mine to my 5D MK II and pushed on the lens, and of course, it would not autofocus because the barrel could not move with me pushing on it. I removed my finger and it worked fine. I tried squeezing the barrel too, but that has no affect.
Then, it dawned on me that what they must be saying is that some cameras lock up when you do not allow the lens to autofocus by pressing the focus barrel or focus ring on the front of the lens.
Thats why the fix is firmware for the camera. nothing wrong with the lens.
kdsand:
Well heck.
I guess I had that happen on my 60D.
I was fiddling around a bit absent minded & the lens moved inward with a fairly light pressure made by my finger. I saw it move about 1/8 inch :o (oops) & thought that didn't seem right.
I had to pop the battery out & back in to get functionality back in the lens ( didn't try re seating the lens ). It seems it just froze up causing no damage :). Definitely sensitive, glad their doing a fix because it could be a pain in the butt ox if it happened often.
Mt Spokane Photography:
--- Quote from: kdsand on August 07, 2012, 01:08:44 PM ---Well heck.
I guess I had that happen on my 60D.
I was fiddling around a bit absent minded & the lens moved inward with a fairly light pressure made by my finger. I saw it move about 1/8 inch :o (oops) & thought that didn't seem right.
I had to pop the battery out & back in to get functionality back in the lens ( didn't try re seating the lens ). It seems it just froze up causing no damage :) . Definitely sensitive, glad their doing a fix because it could be a pain in the butt ox if it happened often.
--- End quote ---
If you push the end of the lens barrel to put on the cap, or whatever, it will telescope in, some may take more perssure, but all of them move.
What should noot happen is for the camera to lockup when it senses a lens movement.
Wideopen:
Haven't had any issues with mines mounted to a 7D yet.
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