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Why? What exceptions to the physics embodied in the calculators do these lenses accomplish? And if different assumptions are made, why would they not apply equally to all lenses?
Consider the differences in background blur (bokeh) between lenses. With the same diameter blur disks, some lenses will produce very smooth, "creamy" backgrounds, while others can be quite harsh and "edgy," depending on details of the blur disk. The transition from in to out of focus is just "microscopic bokeh": the precise shape of the spot the lens produces as you go in and out of focus can make a big difference in whether the image quickly blurs out to smoothness, or instead still shows harsh, perceptually sharp, edges further from the focal plane. If you magnified the shape of the circle of confusion near the focus point for different lenses, you'd see that they vary far more than bigger bokeh circles: you get complex, colorful shapes nothing like the uniform circles that a simplistic depth-of-field calculation assumes.