Canon 70-200mm F4 IS internal reflection problem.

brightcolours wrote:

That photo probably was one taken with a filter mounted in front of the lens.

You probably just think you have taken it off. Throw the filter away and you can never be confused again... And your mirrored through the optical axis ghost lights will be a thing of the past (probably).

If you get it with images that were really taken with no filter, the cause is the shape of the front most element in the 70-200mm f4 L IS USM, which has quite a flat back surface. But I am not convinced yet that that image you showed was not with filter.