I wonder if software alone, or perhaps software combined with a seeing monitor/recorder, could work as well as a deformable optical surface driven by a seeing monitor? Re-construct a diffraction-limited image from the data later...is this an old idea, or a dead end? I'm envisioning a green laser pointer, or relatively inexpensive component laser module, monitor telescope with CCD, all riding on the main instrument with the imaging CCD...might need a collimator on the laser also. I'm thinking that by not doing it in real-time you can reduce the computing demands on the hardware. Enough to make a difference? Incorrect assumption? What does the FAA say about lasers shooting into the sky? Brent, Rich, and any other computer experts on the list? C. __________________________________________________ Do you Yahoo!? Yahoo! Mail Plus - Powerful. Affordable. Sign up now. http://mailplus.yahoo.com