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

Lens AutoFocus Micro Adjusting

Mencho
Apprentice

What is the recommended distance a target must be placed when making AFMA?


1 REPLY 1

7D5D
Rising Star
From the FoCal manual:

Different distances to the target can yield different AF micro adjustment results. Due to the way the autofocus system operates in a camera, a single AF micro adjustment value will almost certainly not provide perfect operation at all distances. Each result obtained at a specific distance is valid for that distance. Ideally, you should calibrate at around the “most used” distance. Canon recommend a distance of 50x the focal length (e.g. 2.5m for a 50mm lens), but this will only yield a value correct at 50x the focal length, which may not be appropriate for the lens in question (e.g. a macro lens). It is also worth noting that the AF micro adjust solution may start to move significantly as the test is run close to Minimum Focus Distance (MFD) of the lens, so it is not advisable to run the test with the camera very close to the target. It is important that the target does not move during the test (the software checks for this and alerts you if there is a problem), so the camera should be mounted on a tripod.

I do 25 - 50 x the focal length
Announcements
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.
10/14/2022: Help ensure your autofocus is properly aligned with a Canon Precision Alignment
09/19/2022: New firmware version 1.0.4.1 is available for EOS C70
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
07/28/2022: New firmware version 1.2.1 is available for EOS-R3
07/21/2022: New firmware version 1.6.0 is available for EOS-R5
07/21/2022: New firmware version 1.6.0 is available for EOS-R6
07/21/2022: New firmware version 1.1.0 is available for EOS-R7
07/21/2022: New firmware version 1.1.0 is available for EOS-R10
07/14/2022: New firmware version 1.0.1 is available for CR-X300
07/01/2022: New firmware version 1.3.0 is available for PowerShot PICK
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
06/07/2022: New firmware version 1.0.3 is available for EOS M50 Mark II
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.
01/05/2022: Welcome to CES 2022!