Robert, I tried masking off the center of a pc' of glass with a mask and sandblasting it, then remove the mask and sandblasted the circle with reduced pressure. It worked except that the masked center is thicker than the rest of the glass. The process of sandblasting removes stock from the glass. On my test piece the center ended up about .011 inches thicker. A little to much considering the thickness of the average piece of film. The remainder of the glass maintains .002" to .004" thickness. Installed on the camera just to see what the difference looks like shows that there is not much difference. The circular center does not look much difference than the rest of the glass. When viewed with a loupe. This test shows that I can reduce the pressure for sandblasting the glass which will make it easier to maintain the thickness evenly over the entire pc of glass. Like I said before, the brightness as compared to the acid etched glass is dramatic. I am going to send a pc of glass to Ron Baker to look at so he can see the difference compared to the glass that he grinds. Phil McCourt _______________________________________________ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
