I discovered a good blog for Real Estate photography that has been around a lot longer than I.
I am not a real techie when it comes to cameras. My Digital SLR Olympus cameras work for me. I can’t, off the top of my head tell you what lenses I use. I am visual and have to look through the lens to know if it is going to work for what I am trying to accomplish. So, if you are in need of a new camera to use for real estate photography, I suggest you go to this page: http://photographyforrealestate.net/cameras/. They also have suggestions for smaller, less expensive cameras and suggested lenses.