I recently made a lens purchase through a POTN sale thread. Just to be upfront about everything, I have already left positive feedback. I have sold and purchased several items on POTN sale threads; this is not my first rodeo. It is the first time I did not get exactly what I was expecting.
The seller stated in the sale that the lens worked perfectly and was in great condition. I have tested the lens to my satisfaction on two bodies, a 60D and 6D. It does indeed work perfectly. It is also in great condition..., now.
My issue was the cosmetic condition of the lens when it arrived. Both front and rear elements were so dusty that I had to clean the lens before I dared mount it. The front element had some goo on it that took several liquid-cleanings to remove. The photos in the ad did not show the condition of the glass. Honestly, if they had, I would not have purchased this lens. In the end, I got it cleaned up just fine. There are no scratches or blemishes in either element, or their respective coatings.
There is minimal dust inside the lens, that will never affect a photo. I count 6 tiny specks of dust. The seller did not disclose the dust. My first guess is that there is no way he could have known it was there, due to the condition of the exterior elements. On top of that, most lenses get some dust in them eventually.
In the end, I got a good deal on a nice piece of glass with no issues. I am happy with that, and the transaction is finished. I did not like having to clean up a lens before I could use it. Should I just write it off to some folks have different standards? Should I mention it to the seller? Should I just ignore it?