Hello, I'm interested in purchasing a used Nikkor-W 150mm LF lens from a local dealer, and had some questions: 1) The rear element has the words "Lens Made In Japan" stamped in WHITE on the outer surface. I've normally only seen this stamped in BLACK on LF Nikkors, so I was just wondering if anyone knows if this is OK, or whether this might mean it's a rear element that is NOT matching to this particular lens? 2) Thoughts on the lens itself - quality, sharpness, contrast? I'm brand new to this great site, and appreciate any insight given. Thanks in advance.