Originally Posted by
Skippy
When I got home and attached it to my camera and looked through the
viewfinder, I saw it had two black dots. The lens was a refurb. I was
surprised to see black dots/specks in the lens.
Seeing black dots in a lens through the viewfinder is unusual according to my limited experience. My 24-70L has a rather noticeable dust inside it but I don't realize anything at all in my viewfinder. It does not seem to show up in my images even at F11 or F16. However, I do see black dots in my viewfinder because my focusing screen inside the camera body has dust on it - that's 99% of the black dots I see through my viewfinder. They're rather easy to clean too.
You can have a simple check by unmount the lens and then look through the viewfinder under good lighting at a white wall. If the black dots are still there rather in focus while everything else are just white, it's the dust on the focusing screen not in the lens.