cancel
Showing results for 
Show  only  | Search instead for 
Did you mean: 

Why won't canon lens fully work in autofocus.?

sphotocastle
Apprentice
Canon lens 28-105mm attached to 5dmarkiii body will not always work in auto focus mode. I think I can occasionally get it to work in alfocus but even in manual the lens occasionally won't register focused objects. Do I have a problem with the lens or do I need to change a setting somewhere to get the camera to know what lens is on it?
3 REPLIES 3

ebiggs1
Legend

Not having your camera and lens in hand. I will still submit the lens is at fault not the 5D Mk III.  This lens is one of the poorer lenses made by Canon.  It is no longer made and has been discontinued for good reason.

Try a different lens on the 5D and see if it works better.

EB
EOS 1DX and 1D Mk IV and several lenses!

JonKline
Enthusiast

Assuming you have the switch on the lens set to AF, and the camera set to use AF, that's all you should need to do.

 

I would suggest you send your lens in for servicing.

______________________________
I'm a cinematographer in Chicago using mostly Canon gear. I also founded MKE Production Rental in Milwaukee.


@JonKline wrote:

Assuming you have the switch on the lens set to AF, and the camera set to use AF, that's all you should need to do.

 

I would suggest you send your lens in for servicing.


Ah, this thread brings back memories. The 28-105 was my first lens on my first DSLR. I still have it, though it now resides on the sparest of my spare cameras (the one that goes to the first grandchild that shows any interest in a camera that's not part of a cell phone). It's not nearly as bad as Ernie Biggs makes it out to be, and I got some good pictures with it. But if it broke, I wouldn't pay actual money to have it serviced.

 

And I wouldn't dream of insulting my 5D3 by using that lens on it.

Bob
Philadelphia, Pennsylvania USA
Announcements
01/18/2023: New firmware version 1.1.1 is available for EOS R6 Mark II
01/09/2023: Help ensure your autofocus is properly aligned with a Canon Precision Alignment
01/03/2023: Welcome to CES 2023!
12/08/2022: New firmware version 1.0.5.1 is available for EOS C70
12/07/2022: New firmware version 1.7.0 is available for EOS R5
12/07/2022: New firmware version 1.7.0 is available for EOS R6
11/22/2022: New firmware available for EOS R3, EOS R7 and EOS R10
11/16/2022: We're thrilled to be ranked among the Best Employers for Veterans in 2022 by Forbes.
08/31/2022: New firmware version 1.1.1 is available for RF 70-200mm L IS USM
08/09/2022: New firmware version 1.2.0 is available for CR-N 300
08/09/2022: New firmware version 1.2.0 is available for CR-N 500
07/14/2022: New firmware version 1.0.1 is available for CR-X300
06/10/2022: Service Notice:UPDATE: Canon Inkjet Printer continuous reboot loop or powering down
06/07/2022: New firmware version 1.3.2 is available for PowerShot G7 X Mark III
05/31/2022: Did someone SAY Badges?
05/26/2022: New firmware version 1.0.5.1 is available for EOS-C500 Mark II
05/26/2022: New firmware version 1.0.3.1 is available for EOS-C300 Mark III
05/10/2022: Keep your Canon gear in optimal condition with a Canon Maintenance Service
05/05/2022: We are excited to announce that we have refreshed the ranking scale within the community!
04/26/2022: New firmware version 1.0.1.1 is available for EOS R5 C
03/23/2022: New firmware version 1.0.3.1 is available for EOS-C70
02/09/2022: Share Your Photos is back!
02/07/2022: New firmware version 1.6.1 is available for EOS-1DX Mark III
01/19/2022: READY FOR ANYTHING EOS-R5 C
01/13/2022: Community Update. We will be retiring the legacy profile avatars on 01/20/2022. Click this link to read more.