If you have one of these eyepieces have you noticed a flaw in the lens opposite the end you look into. Put the cover on the eyepiece and go outside in the shade and look at the lens. I have gone through 3 of these eyepieces and they all have a gray looking smudge on the inner part of the lens. I take pictures with my iPhone through my 11 inch Celestron HD telescope and the gray image on the lens shows in the picture of the star I take a picture of. Has anyone else had this experience?