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

I bought a used 5D Mark III, and there's one thing I cannot stand about it.


My previous Canon DSLR was a 40D (which I absolutely loved). It's been a long time coming, but I recently upgraded to a 5D Mark III. The one thing that is driving me crazy about this new camera is the shutter button. On my 40D, there was a discernable detent at half shutter. This is where I would lock focus and recompose, if necessary. The 5D Mark III does not seem to have this detent at all. I can half press, but I have to hold my finger in place with nothing to rest on before pushing down all the way to take the photo.

Is this how they were made, or is my shutter button just worn out, or am I just using this camera wrong?


Reset the camera. Seems like back button focus is activated.

I have both a 40D and 5D Mk III right now and I see no difference in the shutter button half press or full press functions.


On the 5D Mk III the AF-ON button on the back of the camera is always enabled by default. There are custom functions which change the way the both the shutter button nd AF-ON button works. 


You must either have a custom function enabled, or your shutter button is not working properly. 



Mike Sowsun


I have neither of those bodies, but two different Canon DSLRs.


Both have a noticable "stop" when pressing the shutter button to meter an focus. Additional force is required to depress fully to actuate the shutter.


Sounds like your 5D shutter button may be defective if you don't feel that "stop" effect.

John Hoffman
Conway, NH

1D X Mark III, Many lenses, Pixma PRO-100, Pixma TR8620a, LR Classic


The 5D Mk III is a wonderful camera.  It is certainly worth sending to Canon for a C&C.  I would do the rest and when that doesn't help call Canon for the C&C. 1 (800) 652-2666

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