I use CaptureWiz Pro, has full screen, partial, about 2 minutes of video (have sent movies to support, now if I click here this happens!!). And just made a correction in a formula by doing a "stiky" that allows to take a partial screen snapshot in this case Support/Resistance numbers off of an E-mail, then post it on top of screen to copy or write in parts of a formula. Real handy, trail free, costs after that.
By the way I think I posted a link while back were Camtasia was offering free download of Studio 3, through a UK web site. Works great, can send link if interested. Jerry Gress Stockton, Ca.