Help with lens issue!

[Cabledog]

So I picked up a mamiya 6 with the 50mm lens for a pretty good deal. Everything is in perfect condition except I just noticed what appears to be decementing on the rear element. Can anyone tell me if this will affect image quality or cause diffraction issues?

 

[xayraa33]

I would doubt that would greatly effect image quality in photographs .

 

[jonmanjiro]

Help with lens issue!

The white dots around the edge? I'd say that's schneideritis. It looks like a pretty mild case. I suspect at the most you "might" see a very minor increase in flare when shooting in difficult lighting. Most likely you won't see anything at all.

 

[Cabledog]

How can i tell if it's all the way through the lens to the center or if it's just at the edges?

 

[jonmanjiro]

Assuming it is schneideritis (which it certainly looks like), it only forms between the edge of the glass elements and the metal lens barrel.