The largest difference between monitor and projector use is the greater sensitivity to ambient light with projectors. If you wish to have good quality projection display, a very dark location is required. If your location is not dark, your dynamic range and saturation will be compromised. Monitors are calibrated with the Spyder in direct contact to the display, while projection screens are calibrated with the Spyder at a distance from the screen, aimed directly at the screen. Beyond that, calibrating on a projection surface is not much different than on a monitor, and with fewer user controlled variables to consider. Just reset the projector to Factory Defaults, set the target as Gamma 2.2/Native Whitepoint, position the Spyder in front of the screen according to the on-screen directions, and allow the calibration routine to run. Then use your new profile whenever you are displaying images through your projector. You can even choose to build extra profile versions for use in less ideal ambient light conditions.