Ghost Pictures: Vortex or Camera Strap?

Amanda sent this picture into us. Is it a ghost vortex (or portal), moving orb or a camera strap? Well, it is hard to tell for sure, as a camera strap close to the camera will produce a similar effect. However, this anomaly is more see-through than what we would expect with a camera strap, and is directly in the center. Most camera strap photos have the strap to one side or the other. We will let you decide...

"My friends and I were outside at night. My friend had jumped a fence, and I took a picture of her while she was on the fence. This appeared in the picture. I was wondering if you could let me know what exactly it is or could be??? Could it be a ghost vortex?"