There are some times that are set in stone: we will be at your hotel (or meeting your train) when we say we will, and we will get you back to your train in time so that it's not all a rush. And in France, lunchtime is sacrosanct. Apart from that we can be flexible about how much time we spend at the various chateaux and wineries we might visit on your tour.
This means that if you see something you would like to photograph all you need do is ask, and we will stop the car when it's safe, and if necessary go back for a better view. As long as it doesn't make you late for your train back to Paris there is always time for another photo.