I am a pro-- I have earned 100% of my income via image making since 1989. Anyway, I have used all manner of equipment, and my Hasselblad glass is still blemish free! BUT my new 16-35mm Nikkor has gotten quite a coating blemish(s) from rough/carless use recently. I usually scoff at people selling highly blemished Leica glass saying "does not effect images" as if this were the case why not send lenses out with blems from the factory. I have prepared to send the lens to Nikon for repair/replacement of front element. I shot an assignment (partly) with this lens this morning in a high flair situation... and at least in this instance I can not find evidence in image. Shall I wait to send it till I do? They are ugly central blemishes. I would rate the lens as a 5 on a 1-10 scale right now. I had a 20mm with a blem that showed up in images 20 years ago. Not really looking for answers/advice... Just wondering what the nastiest lens blem some of you have trusted your income with? Cheers.