5dc burning up aperture motors?

Canon you are really pissing me off right now.

I have owned this 5dc for about 7 months and two lenses mounted to this now have ****ed up apertures. I noticed it when I put a cheap 28-90 on it a while back, and the aperture motor died. Then my 24-105 f4L went, about a month ago. I put another 28-90 III to hold me over until the 24-105 gets back, now it's got the same problem the first two had. I can still stop down at 90mm but everything else is ****ed.

Could my 5d be burning up aperture motors? My 70-200 f4L IS is fine. Does the EOS system power the aperture motor or does it send a general amount of power to the lens and the lens regulates voltage?

I'm about one more broken lens from switching to an Olympus E system or Nikon, probably a d7000 since I have a slew of fast manual-focus AI primes.

Are you asking for feedback?

This is not some kind of "issue" with 5DCs, in fact you may be the first person I've heard about with this problem.

So, I'd speculate that your body, which is several years old, may have developed a problem. Maybe if you sent it off to Canon they could find something wrong. But sadly, electronic devices do eventually get one problem or another, but this one could get even more spendy if you don't have it taken care of.

And, if you do decide to get rid of it, please exercise full disclosure so you don't just pass this problem on to someone else!!

Have you tried the lenses on any other body? If they work on another body the aperture mechanism is fine.

It could possibly be dirty contacts causing the issue, if the camera contacts are dirty they may work OK with a lens with clean contacts, but if dirt transfers to that lens the combination may be enough to cause a loss of signal to the aperture motor.

It may not be the problem and your 5D is damaging the lens motors somehow, but that is something I have never heard of before. As you bought the camera used, you have no knowledge (I assume) of how well it was maintained by the previous owner and, if the contacts haven't been cleaned in a long time, that could be the issue. A quick clean will either fix the problem or confirm that there is a bigger issue with the body.

I am beginning to suspect it could possibly be a body issue, but the 24-105, 70-200 and the 5d itself are all off to Canon toward the end of this month anyway so I'm going to have them sort it out.

My 70-200/4, 50 1.8, 80-200 f4.5-5.6 and Quantaray 19-35 all work just fine. I'm just trying to find a common denominator here. Amazing sharpness on that 80-200 as I have noticed recently.

The affected lenses do it on all bodies, 35mm and digital, as well as my 400d. To my understanding the voltage regulation is done within the lens itself. Hopefully the gods at Canon can sort this out, I love this system to pieces but it's costing me shots and I have a wedding coming up toward the end of this year / beginning of next year and I don't need stuff not working.

Hmm, so in the OP you indicated that all these problems started with the 5D, but now they are common to all your bodies? Did anything actually start with the 5DC? If all three did, then the body should go in with at least one of the lenses!

tonylong wrote in post #13227989
Hmm, so in the OP you indicated that all these problems started with the 5D, but now they are common to all your bodies? Did anything actually start with the 5DC? If all three did, then the body should go in with at least one of the lenses!

all 3 are going in together, doing it all in one fell swoop.

I purchased all three from separate areas all at once, and all three aperture failures were after the purchase of the 5d. It still doesn't make sense because my other lenses are fine, in particular the 70-200 f4L IS and that spends more time on the camera than anything else. I have literally gone weeks with that lens mounted.

It's going to be an expensive package but I am confident all the issues will be resolved and I will have a normal EOS system again. I have restored faith in the EOS / L system after seeing some of the wildlife I shot today with that gripped 5D / 70-200 f4L IS combo. WOW. Would have never got that good of a shot on anything else.

Well I was able to trade the 28-90 in for another 28-90 at the pawn shop and this one seems to be fine, so the experiment will go as follows. I will use this lens ONLY on my 400d, Elan 7e, Rebel Ti (looks pretty cool on it) and EOS 650. NOT on the 5D. The following week I will use it exclusively on the 5D. If the aperture motor burns up on it, then we know what the problem is.