Constant focus shift on tap to focus

[JeffreyEttinge]

I have my R8 in tap to focus mode. When I move the focus square by tapping on the center of my screen, the square very frequently will just shift on its own if I do not immediately shoot. Most often it shifts to the far-right side of the screen. I am constantly having to drag it back to center.  How do I keep this from happening? I am using an EF lens with an RF/EF adapter.  Could this have anything to do with it?

[Waddizzle]

Welcome to the Canon Community Forums!

Are you using the rear display exclusively to control the camera? For acquiring focus on a subject? For firing the shutter, too?

[JeffreyEttinge]

I am using the rear display touchscreen to set the focus point. I do not use it to fire the shutter. However, it just occurred to me that I am looking through the viewfinder also as I touch the screen and take the shot. Could it be that the proximity of my face to the screen is causing the focus point to shift?

[Waddizzle]

“ However, it just occurred to me that I am looking through the viewfinder also as I touch the screen and take the shot. Could it be that the proximity of my face to the screen is causing the focus point to shift? “

Yes! The touch screen can be setup so that  the top left corner can be used for touch control. Instead of the entire screen, you would only need to use a portion of it.