I was on a location, last weekend where, the director wanted to shoot into a car window that was on the floor (car shop) he wanted to film the reflection that was being casted on the glass and then rack focus to a hand holding the glass.
In order to this he measured the distance from the camera to the hand to capture the hand in focus when he shift focus and then he measure the distance from the subject walking to the glass and then added the distance from the glass (hand) to the camera.
Is that accurate? you need to measure the distance from the subject reflected to the mirror and add the distance from the glass to the camera?
In order to this he measured the distance from the camera to the hand to capture the hand in focus when he shift focus and then he measure the distance from the subject walking to the glass and then added the distance from the glass (hand) to the camera.
Is that accurate? you need to measure the distance from the subject reflected to the mirror and add the distance from the glass to the camera?