Canon 24-105 zoom creep

I have a problem with zoom creep in my Canon 24-105 lens. In fact, in just a few minutes of walking with the camera around my neck, the lens will creep all the way from 24mm to 105mm. Pointing it downward from a tripod is also a problem if I need to keep the shot set up for more than a couple of minutes.

Has anyone ever sent one of these lenses to Canon to see if they can tighten the damping? If so, what did you think of the results?

I've had the same problem with a 28-135mm Canon lens. It needed other repair and I asked them to tighten up the zoom action in the process of fixing the lens. They did and within 6 months it was having the same problem. An angle of less than 45º isn't usually a problem but farther down it is a problem. You might try gaffer tape to stop the zoom ring from turning when you don't want it to. I've seen lenses that have a 'zoom lock' but the one's I've looked at only lock in the shortest position which isn't much use when you are working with the lens pointed downward as in macro photography. If any lens engineers are listening... a zoom lock that works at any zoom length would be great.

I'm a bit surprised you have an issue with zoom creep on the 24-105 but it really can't be compared to the 28-135 they are completely different classes of glass. I haven't had any issue with this on my copy of the 24-104 and I'm sure Canon could correct this issue. A small amout of creep when carrying it is probably normal but you shouldn't see this on a tripod standing still. Normally zoom locks are only found on longer glass at least in my experience and generally than only to keep them zoomed all of the way in when carried or stored.