This is more announcement/rambling than question. I got back my first transparencies that I shot with my new (to me) 150mm f/9 G Claron. My guess at real aperture was fairly close. I mounted the lens in a press shutter from a 105mm lens. I am finding the ground glass to be very dark. I may have to invest in a darkcloth. I am currently using a black t-shirt. The fact that the pictures were taken at dusk didn't help any. There is one shot that I might have printed but this was mostly a learning experience.