Ok, 6 hour class study period break.

After wading thru 20 sites and some of their source references, I have a working understanding(I hope) of Knife edge, Ronchi screens, Hartmann variations and diffraction focusing.(the "snap" you hear is neural critical mass). Needless to say the better methods(not Hartmann) ALL require high resolution CCD camera's with focusing/pixel/intensity software OR multiple shots using blown up 35mm film on a star with a calibratable focuser. Which leaves me in a poor posture at this time. At my level, the triangle addition to Hartmann would only show me which side of focus I am on. Multiple holes without CCD & software would be useless. The converging/diverging lines by rotation would work if I can locate and mount a mickey-mouse vernier dial(electronic), or obtain a graduated helical focuser. The latter would be easiest. To go beyond my present limitations does require me to find a 35mm SLR focal plane shutter camera or be stuck forever with marginal Hartmann focusing technigues.....Sure do like those diffraction methods though!, especially the first one that was publicized....