@jerry Nice, but I never got the point of macro rails (unless it's for a bellows system). If you've got a subject that won't move for this long while you setup multiple shallow DoF shots at wider apertures, you could just take a single long exposure shot at narrower aperture and deeper DoF. There's lenses that will get you essentially diffraction-free shots at f/16 and that becomes f/32 with a 2x macro extender... Then take a single additional shot at widest aperture for creamy bokeh and voila. Or am I missing something?