water mark? fungus? inside front element

Nasty looking. It sure looks like coating damage. Are you sure it isn't on the surface? Glare some light on it and look for a surface disturbance.

It may well not have any noticeable effect on images though. It is surprising what causes problems and what doesn't.
 
I doubt it's on the inside if it suddenly appeared. I had beer splatter on my gear and ate the coating at the lens in a couple spots. Didn't affect images, but didn't look like this. I've seen and cleaned a lot of nasty lenses, but nothing like this. I'd get a tech to look at it.
 
I haven't shot in a while so I don't know how long its been there. It wouldn't come off when I tried wiping the front.

I finished a roll today, and will see if it comes out on the photos. But I will probably still take it to a tech sometime this week.

Thanks everyone, Merry Christmas!
 
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