<span style="font-family: Arial; color: black; font-size: 12pt; mso-ascii-font-family: Arial; mso-fareast-font-family: +mj-ea; mso-bidi-font-family: Arial; mso-color-index: 1; mso-font-kerning: 12.0pt; language: en-US;"]Another point about dust or a glass defect, does the defect's light path actual land on or offthe image sensor?
<span style="font-family: Arial; color: black; font-size: 12pt; mso-ascii-font-family: Arial; mso-fareast-font-family: +mj-ea; mso-bidi-font-family: Arial; mso-color-index: 1; mso-font-kerning: 12.0pt; language: en-US;"]
The lens will focus a circle image onto the back of the camera sensor's area, but only a rectangle area will land on the sensor itself, so the area off the sensor never gets captured in the photo.
<span style="font-family: Arial; color: black; font-size: 12pt; mso-ascii-font-family: Arial; mso-fareast-font-family: +mj-ea; mso-bidi-font-family: Arial; mso-color-index: 1; mso-font-kerning: 12.0pt; language: en-US;"]The resale inspection of the defect may cause an issue, buttaking an actual image with the lens should put the issue to rest.