From 5D Mark II Team
Description of the problem:
When a Canon EF 100mm f/2.8 Macro USM lens is mounted on the camera and the user manually changes focus (rotates focus ring), the lens changes the iris/aperture “by itself”, even when the camera is in full manual mode.
It is not normal, and should not happen. The tests were made by several users with many copies on many camera bodies, so it’s not an isolated lens problem.
▪ This malfunction always occurs in this situation:
When the camera is set to M (Manual) mode and in Live View mode (Still+Movie – Movie Display), which is the correct mode for “full manual control” in movie mode.
Read more about the issue below.
http://5dmark2.wordpress.com/2010/04/05/malfunction-in-firmware-2-0-4/
thanks everyone that sent this in
cr
72 Comments
I’m trying to decide between a 7D and 5D…. once I heard about this latest firmware update to do 25fps alongside the full frame sensor decided definatley go for the 5D…. now I’m not too sure…. do you reckon Canon will get this fixed?
Oh, I never thought of that! Thx :D
I just tested my MP-E lens, and the problem reported does not occur. If you rack focus (or magnification in the case of the MPE) while looking through the lens, you can see the apparent diameter of the aperture changing. It does NOT twitch like in the problem report video. (but I only did a very brief test)
But I suspect the MP-E is a special case. The aperture indicated on camera is not intended to be the actual aperture on this lens. With other lenses, though, the aperture reading is intended to be an accurate indication of the actual aperture. This is important for DOF and exposure calculations. Those calculations will fail on the MP-E unless you add an extra step to take the magnification into account.
I’ve no idea what you’re talking about!
> Is this the way Canon beta tests their firmware?
Why not? It’s the way Canon tests their hardware too!