I recently purchased a Kowa TSN-602 with a Kowa 20x-40x Z6 eyepiece. When I look through the scope at 20x to a little above 30X I see small black specks. But the specks disappear above 30x all the way to 40x. So I took off the eyepiece and thorughly cleaned all of the external lenses and put it back together. But the black specks are still there. When closely looking through the objective end of the spotter up close there looks like a few dust specks on the inside of the lense. I wonder if that is causing the black specks. So does anyone know if the problem described would be the Spotter or the eyepiece? I want to return either for a new one but want to narrow down which piece is the problem.