The Johns Hopkins gynecologist suspected of surreptitiously recording patients had more than 1,200 video clips and images depicting them in states of undress, according to prosecutors, a collection investigators believe he amassed over the course of eight years. The recordings — some made on tiny cameras hidden in pens and key fobs — appeared to have started around 2005 and continued until Dr. Nikita A. Levy was discovered, a spokesman for the Baltimore state's attorney's office said this week. Investigators found no evidence that he was sharing the images online. "The conclusion is that he was engaged in this activity on his own," the spokesman, Mark Cheshire, said.