Currently planning a long tracking shot in which the main character parks his car, gets out and walks all the way across the lot, into a hotel, through the first floor and into an elevator at the end of the hall. We are going to have to somehow compensate for the huge light difference from the parking lot (night, 3am) to the lobby. Someone told me that in the opening shot of Boogie Nights, they did the indoor/outdoor transition by racking aperture; how would I go about this? Just have a second follow focus attached to the aperture ring, right? Is there an easier way that I am not aware of?