Interiors: Depth of field and focus stacking

So most photographers know that one of the challenges in photographing a scene where some objects are very close to the camera. And some are very far away, is keeping everything in the frame in focus. How do you deal with that? Well you really have two option, because when you're shooting an interior, you really can't use a tilt or a swing mute camera. Because you have both the floor and the ceiling to keep sharp. So you can't, emphasize one at the detriment of the other, so a tilt shift lens doesn't really help you carry depth of field, right? So you can either stop the lens down, or you can focus stack. And when you stop the lens down, there becomes a certain point, and depending on your format for DSLR, 35 mm DSLRs. It's usually going to be around F8, but you can test this. Diffraction will begin to soften the overall image. And what diffraction is is that there's image forming light coming through the lens. And when that light strikes the blade of the aperture, it scatters just a…