focus - How can I take photographs with a large depth of field without diffraction?

I was looking at some pictures by TSO Photography, and I was struck by how everything in the image seems to be sharp and in focus.

I do realize that to achieve huge depth of field, you set the aperture to the lowest possible value — but doing so causes diffraction, which reduces the sharpness of the picture. Are their any other methods to get such high depth of field (other than focus stacking)?

The camera used in this case was a Canon 5D Mark II — a full-frame camera, so it's not because the sensor is small.

Answer

Unfortunately, Facebook strips the EXIF data from images, a terrible practice, so I can't get his actual settings. However, a wide angle lens with a reasonable aperture that is focussed to the hyperfocal can put a huge portion of the scene in focus. For example: a 16mm lens at f/8 focussed 3.55 feet away effectively puts from just under two feet away to infinity in focus and f/8 isn't going to wipe your sharpness out.

You can understand the concept, and play with some numbers, using the online depth of field calculator to see what I mean. They make a mobile version for various devices too and that can be handy out in the field.