You don't have depth-of-field preview on the camera?

It's rarely mentioned that DoF preview is little more than a minor
convenience. It's likely to show more depth of field that you actually get,
because we usually look at the finished print at an effective magnification
higher than the viewfinder's, and the focusing screen's grain (however fine)
obscures the distinction between what is and what isn't out of focus. *

The safest thing one can say is that if something looks out of focus during
DoF preview, it will almost always be out of focus in the print. The
opposite is not necessarily true.

Canon's DoF preview, when a suitable electronic flash is attached, fires the
flash for about one second. This not only provides illumination to overcome
the dim image at small f-stops, but gives a good idea of the evenness (or
lack thereof) of the lighting.

* In general, the coarser the grain, the dimmer the image, but the
more-obviously objects pop in and out of focus. This is one of the reasons
professional cameras offer a variety of focusing screens.