Interior Photography - what camera and lens

A great deal depends on how the photograph will be used, and especially how large it will be, and also on your photoshop skills. Photos to be reproduced in weekly real estate listings are very small and not very demanding of technical quality. But photos for high quality magazine reproductions or architect's use demand very high quality photos, so you should determine what your target market will be. For high end work I would recommend a full frame camera which will allow you to use prime wide angle lenses to best advantage. You will have to work with wide to very wide angle lenses, or stitch photos together. I don't recommend zooms for wide angle work unless you want to use software correction to correct for the barrel or pincushion distortion which you will find in zooms. Lighting is critical to me, and 75% of the work in an architectural shoot is lighting and arranging the furniture and decorations. Digital has some terrific advantages by being able to blend exposures to balance out lighting. Learn to look at a room and see how the lighting defines the space and volume of the room and then supplement the existing lighting to emphasize important details. I use both strobes and continuous lighting depending on the circumstances. And you will find it very advantageous to visit the site during different times of the day to see how the light changes with movement of the sun. If a space has windows the there will definitely be a certain time when the light is better than others, even if that time is during a cloudy day or after dark!

My wife is a decorator, and I have been shooting interiors for her for several years using my 10D. The lenses are the issue with small sensor cameras, in that I have had to resort to very wide glass to get what would be an easy shot with a FF camera and an average lens. I spent a lot of time fixing distorsion and such in those shots.

I recently purchased a 5D, and have found the holy grail of DSLR camera for interiors. I can use even my 24-70 for a lot of shots now, the excellent high ISO quality means natural lighting and less setup, and the 14mm prime I used with my 10D is sometimes too wide. I will probably invest in a T/S lens next, so I can go from camera to print with far less PP time fixing distorsion. I think with any DSLR, a T/S lens is really needed for interiors (or architecture) if you do a lot of them.