Steve,
Final report…TaDaaaa. It works. In effect I ran the findChessboardCorners on just the one chessboard and had set the “focal distance”? “focal length”? to 1 even though I have no idea what it is especially with this manually zoomed lens. I got the cameraMatrix and distCoeffs and later, when the program detected a laser hit, I used those with undistortPoints before getting the homographed points for the 2nd monitor. Almost every laser hit was spot on accurate except for the extreme left side and even that was just slightly off by no more than a few pixels. The laser hit and the inaccurate translated homographed points were both within the same small spreadsheet cell. For this program that is accurate enough for me not to go any further trying to get those left side hits closer. I’m a happy camper.
Thanks again.
Ed