disable touch & drag AF

[kaftzi]

hello

the AF "square" moves sometimes "spontaneously".... so I tried to disable the touch function, and nothing changes even after I chosed "disable". is it a malfunction?

thanks

[p4pictures]

Hello and welcome to the forum. 

Can you please give us a little more information to be able to help you. It would be important to know the following information:-

• Which camera
• Which lens
• Which AF area or method you are using
• Which mode you are using, P, Tv, Av, M, Fv or one of the basic modes like A+ or SCN
• What kind of subject you are trying to photograph
• Are you using servo, one-shot or AI focus AF

With this information we should be able to get you a solution. 

[kaftzi]

sorry...forgot to mention. 

R8.

LENS 24-105.

usually uses 1 point AF

usually AV mode.

one shot.

general objects, people, nature etc. 

[p4pictures]

Ah thank you for the extra information.

The EOS R8 will still do subject detection even when set to 1-point AF and one-shot, and what this means is that the camera will look around where you place the AF point to find a subject that it can recognise. This might be helpful for some subjects but not all. For a portrait I can aim the 1-point at a person's face and the camera will reposition the AF point on their eye for me. However for a landscape you might want to focus on a specific point and only there.

What you need to do to stop the AF point moving away from where you place it is to change the settings for subject detection to none on the first AF menu. If your camera is set to the default auto, people, animal or vehicle it may move the AF point to what it thinks is the appropriate subject without your intervention.

[kaftzi]

thanks so much Brian for the detailed answer, but the problem is the SCREEN. it is already on "none" for subject detection. I don`t want to change the location of the "focus square" by an incident touch on the screen, and somehow the "DISABLE" of this function doesn`t change anything...

thanks again

[p4pictures]

Realistically this is how the camera is designed to work, so to stop the touch screen working like this you need to disable the touch screen function when shooting.

There are two possibilities; switch off the touch screen control altogether using the Touch control menu on page 4 of the set up menus.

https://cam.start.canon/en/C013/manual/html/UG-08_Set-up_0240.html 

OR, make use of the multi-function lock and disable the touch screen when the power switch is in the lock position. 

https://cam.start.canon/en/C013/manual/html/UG-08_Set-up_0250.html 

You will need to put a check mark in the third item across the screen to lock the touchscreen. 

This is much more intelligent since even with the touchscreen locked like this, pressing the menu, Q/SET or other buttons on the camera temporarily frees up the lock so you can change settings or use the menu with the touchscreen, but avoids you from inadvertently moving the AF point position. 

[kaftzi]

AMAZING!!!!

thanks so much. it works. thank GOD and Brian!!!

[p4pictures]

You can mark the post as a solution to help others find it in the future. Thank you.

[Waddizzle]

I have had similar issues with my R6ii.  Lock button didn’t seem to fix it. I wound up closing the rear display. Problem solved.