I profess no knowledge about making the pinhole (I bought an Ilford Titan) but would think that the quality of the hole would be dependent on the materials used and the skill of the technician. With a lens you are generally focusing on a particular spot that would be the most critical point of focus and the depth of field would depend on the length of the lens and f stop. I suppose you could figure out that spot for a pinhole but I don't think most people approach pinhole photography that way.