All, Apparently my copy of the Lens Vade Mecum is taking much longer than expected....So appologies, but I am not able to do my homework before harassing you all. The lens that I found is a Perken, Son, and Rayment Optimus f/4. It has an iris type of aperture, ranging from f/4-f/22. It has the typical rack and pinion focusing on it, and is about 9" in focal length. Any idea as to its construction ? Anyone have any opinions on it ? I usually would just jump on it, but shipping to my location is rather costly. Thanks !