That is a little confusing, but I think you mean that using a shorter focal length lens is the key...either using one on a smaller format to get the same view, or on a larger format and cropping.
The common saying is the larger the format, the more depth of field problems one has. Which is true, due to the longer lens required to get the same view one has on a 4x5, on an 8x10, for example. But the saying does cause confusion as it does not reference focal length.
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