What's this in my lens?

[scottishguy]

I'm guessing its one of the blades that has somehow come loose inside!

Lens Fault 1 by Keith Haywood, on Flickr

Got it new 4 years ago as part of Canon 550D kit.
Not making any difference to pictures though.
More annoying than anything else.

 

[Cagey75]

Judging by the curve, I'd agree it's one of the aperture blades. Bit like what's happened to my 150mm macro, only it's the OS system that's come unstuck, again, still works. Just not sure as good as it should

 

[BillN_33]

I thought that you were asking about the light brown spot

 

[scottishguy]

Thanks Cagey75, just as I thought it was.
Bill that was me looking through the lens at my monitor for a bright background