Canon 5D Mark II
Yep, I'm a Canon shooter, but I'm not a Nikon hater. Each has it's pros and cons. It just so happens that I started out with Canon and that is what I have built my base of lens around. This is a full frame camera with high ISO capabilities. It is great for inside homes or at weddings when you have low light.
My back-up camera. Yes, all professional photographers should have a back-up camera, and yes, you should take it to sessions. And yes, you should have it charged and ready to go. I hear a lot of folks say they don't need a back-up because they just shoot portrait sessions, not weddings. Well, I would hate for a mom who spent hours getting herself and her whole family ready for a session to show up and have me tell her to go back home and do it all over again another day. That's just not the way I think you should run a business.
Canon 50mm 1.4
This is the lens that sees pretty much like your eye views the scene. It gives the subject a nice 3D look. I often use it with children because I can get close and interact with them while I'm shooting. This is a good lens for low light situations, although for a session, I'm more than likely going to pull out lights to help if the light is that low. I would say it is my go-to lens for indoor shoots. It is a good focal length to capture the scene in tight spaces without the distortion of a short focal length.
Canon 16-35mm 2.8L
So I call this lens the fun lens. I use it for fun, silly portraits. Think family running together or a silly face on a kid. The distortion of this lens can really make for some fun compositions. This lens also picks up a lot of background; hence, I use it when there is a beautiful landscape or sky behind my subject that I want to capture. I'm a sky-lover. I will use this lens at every shoot. Indoor or outdoors - I love it!
Canon 100mm 2.8L macro
Love this lens! Obviously, I use it to catch details of children and newborns, but it is also a beautiful, beautiful portrait lens. I use this lens for most of my outdoor sessions. The compression of this lens is so flattering to adults. Of course, the compression also makes for beautiful bokeh. I use this lens in the studio a lot too. It is a great headshot lens too.
Canon 70-200mm 2.8L
I just added this lens to my arsenal. I needed a longer focal length for some shots, and I'm loving this lens for so many of the same reasons I love the 100mm lens. It is a great versatile lens.
Canon 430EX Speedlight
This is a basic speedlight. I might use this to bounce some light in a dark home or at a wedding. I also use it with an umbrella or softbox to shoot off-camera flash especially with seniors. It is highly portable, and I take it to every session. Always be prepared right.