Macaque borrows photographer's camera to take hilarious self-portraits

[BlancheSplanchnik]

20. if the aperture is closed down, as it would be in bright light, you get high depth of field

That means that most of the shot, from say, 5 feet from lens to the far distance, will be in focus.

So there is a lot of focused area front and back of the point of auto-focus....

With a lower light condition, like this with lots of ambient light but not as bright as full sun, you have a shorter depth of field. So you still have an area before and behind the focal piont that is sharp, but past that area blurs, like we are seeing here.