[pkinchington (Peter (Kanga))]

Originally Posted by sunslayr

Looks like it's on the front AR window as its slightly out of focus. You could probably blow it off with one of those little camera dusters. This is a post from qhy on cleaning, I don't think it violates the warranty. Try blowing the outside first though.

Edit: I should also mention you don't need to do this as it will calibrate out with flats.

Thanks if it will calibrate out I might leave it. I did try to dislodge it if it was external dust by using a blower brush but to no avail.
Cheers Kanga