Finding a real estate photographer in DC is not something that should be difficult. For the most part, they work for different companies and can be found via the telephone book or the Internet. You should never email address or phone number listed with a real estate photography company to discuss projects, unless you want to discuss pricing. For your own safety, you should never give out information regarding projects or sales without first talking to the photographer about the kind of insurance you would need in case of accidental damage of your property. It is always best to use a real estate photographer that uses traditional film, because digital photography cannot properly capture the depth and texture of the tiniest of details.
A good photographer will take the time to view your property through several different settings and then create a photo based on the location. If you are considering placing an offer on a property, you want to make sure the photographer takes several shots of it from all angles. You can ask for a general price or let the photographer set up a meeting with you and explain what it is you are looking for. A real estate photographer that uses traditional film is going to cost more than one who uses digital, but this is a small sacrifice to make when you are purchasing property in DC.
If you are not happy with your choice of real estate photographer, you should try and find a replacement who is. This is much easier than trying to get another person to do the work. Most photographers who have experience using digital technology can transfer their skills to use on film and continue making great images. They may also charge less if they are used to shooting digitally than they would charge if they were shooting solely film.