Ok heres my situation: Im the TD at my church (We have an ETC Unison/Source 4 Jr Zoom based system) and I have a special that highlights the cross on the main wall of the chancel. I use GAM pattern 256 with a hard focus to get a perfect cut on the cross. However, due to the location of our main front light (Box Booms) their is a major keystone that occours to the gobo. The only way to avoid this is to take the gobo way out of focus, but when I do this I lose the sharp definition that I want. When I discussed my problem to a friend LD of mine, he told me that there is a ellipsoidal that corrects keystoning by allowing rotation of the main lenses inside the housing. I have never heard of such a thing and sounds as if he is getting confused with some type of camera. Can anyone verify this for me? If not, is there a way to jerry-rig the lenses of a Source 4 Zoom (25-50) to accomodate this? (If this is not possible, my next idea is to start making cross gobos that keysotne the opposite direction).