I have owned many lenses, but I have never seen anything like this on any of my glass. I received a Minolta MC 58/1.4 PF today, and, while the front element is immaculate, the rear element has these very small dots or specs. I first thought they were "cleaning marks," but after looking at the lens carefully, and with a flashlight, I see that they are not marks or swirly lines, but dots. I tired some Formula MC and a microfiber cloth, and it had no effect. Overall, they are somewhat difficult to notice, but they are there. They also seem to be grouped in the center of the element, while the outer portion of the element seems clear. The dots themselves look to be clear, not having any particular color or tone. Could there be something sitting on the inside surface of the rear element? Is it perhaps early stages of fungus? The "cleaning marks" theory just does not seem to describe this well. I have a seven-day return privilege, but I would like to see if I can keep this lens, as it is fine otherwise. I welcome your thoughts.