During a visit to Providence Canyon State Park on July 11, 2015, while standing at the edge of the canyon near the visitor center, my wife took a three shot sequence of photographs. There were no aircraft in site. If there was any kind of aircraft, she would have waited until the aircraft had moved out of the shot before taking the photograph. We neither heard, nor saw any type of aircraft while at the park. Nor did we feel anything, nor lost any time. Monday, July 13, 2015, when looking at the photos she took, she noticed an anomaly on 2 of the photos. IMG_7339 and IMG_7340 had a small greyish streak that had moved during the taking of the photos. IMG_7341 was the third photo of the set that was taken but the anomaly had moved out of frame by the time it was taken. The camera used was a Canon 70d with a Canon 24-100mm L lens.