I am just getting started in LF. I have been reading past posts on focusing with a loupe. There seems to be agreement on about 4X or 5x and the fact that the qu ality of the loupe is not really that imprortant. I was wondering if anyone has ever tried an Optivisor. This is about 4x. I have been using one for model work. It would seem to me there would be an advantage to having both hands free to wo rk the camera. Am I overlooking some disadvantage to this system? Thanks. JimJ