Kurt, Thanks for the VBA code. I stuck it in a Microsoft Access form and got it to work.  Also thanks for the link. I see all the work is already done for me, but I had fun messing with the code anyway.  It has been years since I messed with code and even longer with Access.   Now that I have the surface brightness, all I have to do is stick it into this formula: E = (Pdesired/ Pmax)*(N^2/SB) Where B is the surface brightness you gave me and S is the camera ISO, N is the focal ratio of the scope, and Pmax is the bit depth of my camera 4096 and with this information it will give me the approximate integration time for what ever object I want to image.   Talk about hoops to jump through.   Thanks   Jim