Hmm, the 100-400mm lens conundrum continues.
I went for a walk today with camera in hand and I was badly missing not having the zoom lens with me.
Looks like I might have to post it to Canon in Auckland and let them work on it. I looked up some stuff online today saying it might just be the contacts that need cleaning. But not in my case, I think it is rather more serious than that.
Ugh, this might be expensive…