Canon EOS 7D Mark II (G) Instruction Manual page 499

AF speed changes depending on lenses used.
During Live View shooting and movie shooting, the AF control method
(phase-difference detection with the image sensor or contrast
detection) switches automatically depending on the lens type and
function used such as magnified view. The AF speed may therefore
change greatly and focusing may take longer.
Focusing takes a long time.
If FlexiZone - Multi is set, it may take longer to focus on the subject
depending on the shooting conditions. Use FlexiZone - Single or focus
manually.
If the movie recording size is set to L 8(59.94 fps) or 7(50.00
fps), contrast detection will be used for the AF control.
The continuous shooting speed is slow.
Depending on the shutter speed, aperture, subject conditions,
brightness, etc., the continuous shooting speed may become slower
(p.142).
When EOS iTR AF is operating (p.128), maximum continuous
shooting speed set with <o> will be approx. 9.5 shots/sec. Also,
under low-light conditions, the continuous shooting speed may
decrease.
If [Anti-flicker shoot.] is set to [Enable] and you shoot under
flickering light, the continuous shooting speed may become slightly
slower, or the continuous shooting interval may become irregular.
Also, the time lag until shutter release may be slightly longer than
usual (p.185).
The maximum burst during continuous shooting is lower.
If you shoot something that has fine detail such as a field of grass, the
file size will be larger, and the actual maximum burst may be lower
than the number mentioned on page 151.
Troubleshooting Guide
499