Lens coating flaw?

[CathJ]

I happened to be looking into my lens the other day, and noticed an odd purple spot. It's almost as if there's a problem with the coating on the lens.

I tried to take a picture, but it's surprisingly difficult to take a photo of a lens! My best effort is here.

Is this something I should be concerned about? I've never noticed it before, but that doesn't mean it hasn't been there all along... It doesn't seem to affect picture quality at all, but the lens is still under guarantee so if it's a problem, or something that might get worse, I'd rather know about it now than after the guarantee is up!

 

[hilton]

I would take it back assuming it's not a mark caused by you.

 

[genetic]

It looks like it's on the outer most piece of glass on the lens?

I know you've probably done this (just got to rule out the obvious) - have you tried cleaning the lens with the proper lens cleaning kit?

 

[Edduck]

If it is not a physical flaw (scratch/chip/dull etc) then it is most probably just a oil based substance (sweat) or dry water spots that are changing the reflectivity of the lens coating which ends up looking purple. I have seen blue and green spots as well. Wash a microfibre lens cloth in sunlight and rinse it 100000 times to get all the soap out. Then make the cloth ever-so-slightly-damp and gently polish on that purple spot. It shouldn't affect your image quality.