First and foremost, I want to stray from posts suggesting other lenses, because I have pretty much made up my mind, due to many factors. This is a specific question about a specific lens, and I'm looking for any information I can get on it. Thanks. So I want to purchase the Nikkor SW 90mm f 8 lens and the only thing that I'm unsure of that I keep reading about it the brass shim in between the front cell and the shutter. Apparently it is crucial to achieve the great quality of this lens. Since I'm buying used, from what I have read I need to make sure the shim is present it the lens. I'm leaning more towards KEH rather than Ebay because of reliability and also away from MPEX and towards KEH for price. How can I tell if the shim is present? Do I have to call KEH and ask about each lens individually? Or will they be able to tell me that all SW 90 lenses that they have include the shim? Or will I get a "I don't know, they're all packed up somewhere". Nick Again, I am pretty dead set on this lens, and I'm just wondering how I can really go about finding out if the shim is included with the future prospective lens i might get. Thanks.