The Datavideo TP-200 Teleprompter system with prompter software turns an iPad, iPad 2 or iPad 3 into an through-the-lens teleprompter and can also be used as a below-the-lens prompter. What about the eye line when the text is not in front of the lens? I was on a shoot with the talent a little over seven feet away from the lens. Even though the iPod they used was held below the camera lens, the eye line was acceptable.
Pro: Economical, Lightweight (4.2 lbs) through the lens prompting on an iPad 3
Con: Only fits cameras with 8.5 inches between the nut and lens. Software is very basic or slightly buggy.