Using all AF points with AI Servo AF

I was recently asked why the AF point displays of an EOS 7D Mark II (65-points) and EOS 5D Mark IV (61-points) appeared quite differently on the LCD. The reason was nothing to do with the number of points, but the two specific cameras configuration for the initial starting point when using all AF points with AI servo mode.

Two different display possibilities

61pt AF with AI servoThe standard display with the default camera settings, there’s no selectable AF points.
61pt AF with AI servoThe “alternative” display where it is possible to select one of the AF points.

What changes the AF point displays, and why is it important?

61pt AF with AI servo

Above is a screen shot from my EOS 5D Mark IV, which shows Initial AFpt,  { } AI Servo AF selected. Normally this would be set to AUTO, but here I have it set to one of the other settings. There are three possible settings;

  • Initial { } AF pt selected
  • Manual AF pt
  • AUTO

AUTO

61pt AF with AI servo

With AUTO selected, you’ll get the display with no selectable AF points. What this means is that the camera is going to look at all the AF points around the frame, and determine which one to start focussing on the subject with. While you shoot a series of pictures if the subject moves to another location in the frame the AF point will move with it, and keep focus tracking the subject.

Brian-Worley_using all AF points - AUTO

AUTO is a good choice if your subject is clear, and against a plain background. Things that fly, and are photographed with the sky behind them are ideal. Birds, aeroplanes etc. In use you simply aim the camera in the direction of the subject and one of the AF points should find it and start focus tracking it.

Initial { } AF pt selected or Manual AF pt

61pt AF with AI servo

Both of these two options work in the same way and will show the display with a choice of AF points. What this means is that there’s an initial AF point that the camera uses to start focussing with. Once focus has been achieved with that initial point, then the other AF points become active and will be used if the subject moves around the frame.

If you have chosen Initial { } AF pt selected option, you will have a specific location for the initial AF point whenever using 61-point AF mode.

However, if you sometimes use one of the other AF areas, say 1-point, expansion AF or zone AF, the second option can be used to automatically set the initial point for 61-point AF. Then the initial point is derived from the position of the AF point used in the other AF method. For example; if you are using 1-point AF, and the AF point is on the extreme left, when you switch to 61-point AF the initial point will still be on the extreme left.

Brian-Worley_using all AF points_02

Lets take another example of a subject in amongst a complex background. Here I could set the initial AF point somewhere to the right of the frame where the car is going to appear from the forest. This stops the camera choosing some of the closer to the camera, small trees in the foreground instead of the car. Once the car is in focus, and airborne, the AF will track it as it moves over the AF points, switching AF points as needed.

Other cameras…

EOS 5D Mark III, EOS-1D X and EOS-1DX Mark II are almost identical to the EOS 5D Mark IV above. So here’s some of the other cameras.


EOS 7D Mark II – 65 AF points

EOS 7D Mark II all AF points with AI servoThis camera closely follows the EOS 5D Mark IV. Settings are found in the AF4 menu.

EOS 7D Mark II - 65-pt AF

EOS 7D Mark II - 65-pt AF

EOS 7D Mark II - 65-pt AF

EOS 7D Mark II - 65-pt AF

EOS 7D Mark II - 65-pt AF

I’ve written a previous post about the extended possibilities of back button AF on the EOS 7D Mark II. This capability is one of several advanced control configurations that allow the AF area to be switched, and that is where the second “manual AF pt” option becomes more powerful. You could be using single point AF to focus on a bird in a tree, then press a button to switch to 65-pt AF with the initial AF point in the same places the single AF point had been.

 


EOS 80D / 90D / 6D Mark II – 45 AF points

EOS 90D all AF points with AI servoJust as I was about to hit the post button, I noticed the EOS 80D sitting on the shelf, so had a look at that one too. What a can of worms that opened. EOS 80D has a 45-point AF sensor that’s also seen in the EOS 6D Mark II, EOS 800D, EOS 77D and new EOS 90D.

Starting with the EOS 80D. It’s got a similar set of settings to the EOS 5D Mark IV and EOS 7D Mark II. The way to change the settings is custom functions for this camera.

EOS 80D - 45-pt AF
EOS 80D - 45-pt AF

EOS 6D Mark II draws deeply on the EOS 80D, even the custom function number is exactly the same!

Thanks to Canon Singapore, I could download the EOS 90D manual, and found it to also exactly match the EOS 80D with the same custom function number too.

Once you have chosen the desired settings the EOS 80D looks much the same as the EOS 7D Mark II or EOS 5D Mark IV above.

EOS 80D - 45-pt AF

EOS 80D - 45-pt AF

EOS 80D - 45-pt AF

EOS 80D - 45-pt AF


EOS 800D / 77D – 45 AF points

EOS 77D all AF points with AI servoThese cameras use the same EOS 80D derived 45-point AF sensor, but don’t have the custom setting to nominate an initial AF point. This means you’l have to let the camera choose the starting point for you.