Suggest morning flights to stave off the queasies. It is MUCH more a of a risk for a photographer than it is other passengers, even if he "doesn't get airsick." Summer turbulence and heat make it a lot worse. When CAP did its local airborne photography course on a hot summer day last year, EVERY afternoon sortie returned a full puke bag. Having flown with most of the 5 back-seaters in other contexts, they don't get airsick easily at all. And it really wasn't that turbulent; just the normal summer thermals and next to no wind.
In a Cessna, the back seat has an easier time keeping the strut, wing and gear out of the frame. It's much easier for long focal lengths (obviously). The front seat allows for opening the window. The long focal lengths also have the most difficulty pointing and keeping lunch down.
If you're doing houses, you're gonna be real low. Use flaps and keep the speed moderate. Too slow and the plane moves around too much, too fast and the target whizzes by. In the 182, I use 90 knots with 10 flaps. Just like an instrument approach, and for all the same reasons. Remember that under 500 AGL is not legal, and 1000 AGL may be required. If there are any obstructions in the area, it could be even higher. REVIEW OBSTRUCTIONS AHEAD OF TIME. You're poorly configured for tower dodging with a photographer in back.
Correct pointing mostly with rudder; the excursions will be smaller that way, and roll is a LOT more disruptive than yaw for a photographer, as it puts the $#*@% wing in the photo.
If you're planning on doing anything but oblique photos, practice ahead of time. It's possible to do steep turns at 1000 AGL in photo config, but you should practice it without the back seater. It's essentially the only way you can get a nadir shot without attaching cameras to the outside of the airplane. You may need a strong, full power, slip in addition. The photographer will need the shot tight and close in, much like a canyon turn.