topic Re: Canon 28-300 and 5DMkIV errors in EOS DSLR & Mirrorless Cameras

EOS 5D Mark IV error with EF 28-300mm lens, other lenses OK

orthodan — Tue, 19 Nov 2024 14:17:20 GMT

I have had a Canon EF 28-300 f3.5-5.6 L IS USM for many years. My Canon 7D started having problems so I bought a used low mileage Canon 5D Mk IV from a friend when he went mirrorless. After a few shots, I get the error message about difficulty communicating with the lens - clean the contacts. I have thoroughly cleaned the contacts with no benefit. If I turn the camera off, then on, it works for a while then the error recurs. Sometimes it is 3 or 4 images, sometimes 20. I don't have the same problem with any other lens, and I don't have the problem with the 7D body. Is this a firmware problem or a compatibility problem, or is the lens getting old. If I am looking through the viewfinder in manual mode, I notice that there is a metering problem with the image where I get the error message.

Re: Canon 28-300 and 5DMkIV errors

shadowsports — Sun, 17 Nov 2024 01:53:42 GMT

Greetings,

What is the error message? Err70, 80? Does it happen with any other lenses?

Are you using any accessories?

Since the camera was used, have you tried resetting the camera, testing with different storage media and a new battery? Its too soon to say if its body or lens at this point.

Re: Canon 28-300 and 5DMkIV errors

deebatman316 — Sun, 17 Nov 2024 04:43:43 GMT

When the communication error occurs can the camera still report the F/ stop. If the camera reports F/— or F/00. The camera doesn’t know that a lens is attached. The camera uses the electronic contacts to detect whether a lens is mounted or not.

Re: Canon 28-300 and 5DMkIV errors

p4pictures — Sun, 17 Nov 2024 09:38:43 GMT

This sounds like a lens fault, sometimes failing aperture assemblies exhibit this kind of "sometimes work" problem.

Re: Canon 28-300 and 5DMkIV errors

orthodan — Sun, 17 Nov 2024 14:14:45 GMT

error 001 it doesn't happen with any other lens, and does not happen with my 7D. Only accessory is cable release. Storage media and battery are not the problem.

Re: Canon 28-300 and 5DMkIV errors

deebatman316 — Sun, 17 Nov 2024 14:38:07 GMT

Test without the shutter release cable. If it continues to happen without it. Set the camera to Av Mode and set a small aperture such as F/16. Then press the depth of field preview button. The view finder should significantly darken. If it doesn’t it could be a bad flex cable in the lens. I would press the depth of field preview button multiple times. To simulate a picture being taken. The aperture stays wide open until the picture is taken. This allows the viewfinder to be as bright as possible. I would also zoom the lens in and out too. Years of zooming in and out often times causes flex cable issues.

Re: Canon 28-300 and 5DMkIV errors

orthodan — Sun, 17 Nov 2024 19:19:58 GMT

When I use my EF 400L and 1.4x extender with the 5D Mk IV and the cable release, it works fine, so I don't think it is the cable release. I will try the DOF preview.

Re: Canon 28-300 and 5DMkIV errors

orthodan — Sun, 17 Nov 2024 19:42:31 GMT

I pressed the DOF button at least 50 times with no problem. 1st photo, got error message 001. No cable release.f16

Re: Canon 28-300 and 5DMkIV errors

orthodan — Sun, 17 Nov 2024 19:43:46 GMT

Inside the viewfinder it just reports error. LCD screen shows error 001. No other data

Re: Canon 28-300 and 5DMkIV errors

orthodan — Sun, 17 Nov 2024 20:08:11 GMT

firmware is the most recent 1.4.0

Re: Canon 28-300 and 5DMkIV errors

deebatman316 — Sun, 17 Nov 2024 20:48:25 GMT

This is a lens communication problem. Does the lens work on a different camera to rule out the lens.

Re: Canon 28-300 and 5DMkIV errors

orthodan — Sun, 17 Nov 2024 21:07:01 GMT

the lens works fine on my 7D

Re: Canon 28-300 and 5DMkIV errors

deebatman316 — Sun, 17 Nov 2024 21:26:55 GMT

Does the same test I told you to do on the 5D Mark IV cause the lens to act up on the 7D. I've heard of another similar issue. Lens would work fine on one camera than another it wouldn't. But trying the same test on the camera the lens was working on caused the camera to display an error code. After trying that test on the camera that was working.

Re: Canon 28-300 and 5DMkIV errors

orthodan — Sun, 17 Nov 2024 22:00:36 GMT

did the DOF thing 30 times on the 7D and took 30 photos, no problem

Re: Canon 28-300 and 5DMkIV errors

deebatman316 — Sun, 17 Nov 2024 22:11:57 GMT

This sounds like Contact 1 800 OK Canon. Are the contacts on the body intact and on the lens too. No discoloration either.

Re: Canon 28-300 and 5DMkIV errors

orthodan — Sun, 17 Nov 2024 22:34:21 GMT

One of the contacts on the lens is showing some wear (grooving) but otherwise they look OK.

Re: EOS 5D Mark IV error with EF 28-300mm lens, other lenses OK

orthodan — Sat, 30 Nov 2024 16:14:13 GMT

sent it in to Canon and they replaced the 3rd lens assembly, image stabilizer and rubber mount. Problem solved.