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

Canon lens 15-85mm focus issue

A few weeks ago my 15-85mm began having a focusing issue. Whereas if the lens was sitting idle for a period of time; upon going to use it, it would take 8-10 seconds for the focus to begin working. After this initial period the focus would then "engage" and the lens would function as normal. This was the case in manual as well. In manual, you would have to turn the focus ring back and forth five or six times before it would finally "catch" and then begin focusing normally. Is this normal for this type of lens?

I have the 15-85mm lens and have never had the problem you are describing. My lens can go unused for weeks at a time, since I keep it on my infrared-converted T3i. It sounds to me like you may need to have the lens at least looked at by a camera technician, and possibly repaired.

It could be a battery issue if, for example, the autofocus motor has to wait for a weak battery to achieve the minimum necessary voltage. And the fact that it also happens in manual mode may not necessarily be inconsistent with that explanation. As one of the regulars (Ernie Biggs?) pointed out recently, some of Canon's recent lenses are fully electric, with even their manual focusing rings being nothing but a motion sensor.

Philadelphia, Pennsylvania USA
03/14/2023: New firmware version 1.8.1 is available for EOS R6

03/02/2023: New Firmware Updates Are Available:

EOS R7 - Version 1.3.0EOS R10 - Version 1.3.0
02/24/2023: We've updated Share Your Photos

2/07/2023: New product announcements!

EOS R8 EOS R50RF-S55-210mm F5-7.1 IS STMRF24-50mm F4.5-6.3 IS STMRF15-30mm F4.5-6.3 IS STM
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 is available for EOS C70
12/07/2022: New firmware version 1.7.0 is available for EOS R5
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 is available for EOS-C500 Mark II
05/26/2022: New firmware version 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 is available for EOS R5 C
03/23/2022: New firmware version 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
01/13/2022: Community Update. We will be retiring the legacy profile avatars on 01/20/2022. Click this link to read more.