I have a few questions about this lens. First of has any one used it, if so please share your general experiences with it. I am most concerned with finding out what the image circle is, I plan to use this on 8x10. Also I am interested to know what the sharpness fall off is like. I once used an Ilex 150mm that was of no use to me on 4x5 because the sharpness fell off so quickly from the center of the frame. I know that this lens is also mounted in a No.3 Acme Synchro shutter, can the cells from this be removed and put into a more modern copal 3 without modification/machining?