road_trip_rip

I'm always bummed when I come across a forum thread that describes an issue that I'm having, yet the OP never follows up with the problem's resolution. Well, it's been almost three years since I started this thread, and I have never had the problem since. I've used that lens quite a bit since 2015, and it's worked absolutely fine. I suspect the stabilization problem was due to a weak camera battery, but I haven't done any tests to confirm. So, if anyone else has a similar problem, I suggest using a fully charged battery.

<p>I searched some more and finally found a person who had a similar problem with his 500mm f/4. It turns out that the IS system had some loose and needed repair by Canon.<br> If it is a loose IS system, I think I should keep from whacking it firmly, as that could dislodge it further and possibly in such a way that prevents the lens from getting clear images.<br> Interestingly, the IS system worked fine today. That sounds good, but if it's intermittent, it might be difficult for Canon to diagnose the problem correctly.<br> Until I stop traveling, I'm going to raise the ISO and shutter speeds and try to keep from using the IS just in case further use creates bigger problems.<br> Thanks for the input!</p>

<p>First off, I'm new here, so my apologies if this isn't posted in the right place.<br> <br /> I purchased a used Canon 500mm f/4 lens a few weeks ago. The date code shows it to be manufactured in 2003, but it's in immaculate cosmetic condition: no paint chips, glass elements are spotless, etc.<br> <br /> I used the lens for about 200 shots with no problems. However, just yesterday, the image stabilization has become "jumpy" in the vertical direction (when the camera is in landscape orientation). The jumpiness stays in the same direction relative to the lens even if the camera is in portrait orientation. This tells me that something is wrong with that axis of stabilization.<br> By "jumpy," I mean that the image will float up or down quickly and jitter itself up or down, all randomly. It moves far too much to attain a clear photo at reasonable shutter speeds for this lens.<br> My question for y'all is this: is there anything I can try that might resolve this issue before I send it to Canon for a costly repair?<br> <br /> The lens's electrical contacts were clean, but I cleaned them again with alcohol. I tried the lens with and without an extender. I tried it on a 7DII body and a 5DIII body. I tried it with and without a tripod. No matter what I do, it still has the jumpy behavior.<br> <br /> It's mighty suspicious that this behavior started shortly after Canadian border patrol searched my car, but I figured these lenses are too tough for that to matter; after all, I see these lenses banged up all the time, and they still work fine.<br> <br /> I think I'm destined to just use the lens with IS turned off until I'm done traveling in a few months, but hopefully (though I fear unlikely) someone has a simple fix.<br /> Thanks!</p>