I am looking for information on this lens since I have an oppurtunity to acquire one. I believe this is a single coated lens on a copal 3 shutter. Could anyone that owns one please tell me what their experiences are with the lens. I am mainly going to be shooting black and white but may want to shoot some transparencie film. I will use it on a 5x7 and 8x10 camera. Any input will be greatly appreciated it.