I had a photographer at my second home birth after getting zero pictures during my first home birth and exactly one afterwards of me, DH, and DS1 in the birth pool.
For DS2's birth, we had my midwife, her apprentice, and the photographer there, as well as my MIL and my mom, who were not in the room I was birthing in, but were watching DS1 in a different part of the house. I asked each of our moms to pick up something on the way to our house so people would have stuff to eat. My MIL got donuts and my mom got bagels, cream cheese, and coffee. I also had a specific freezer meal prepared that I got out to thaw while in early labor. Someone started cooking it after the baby was born. Since next baby will be in January, I will probably just freeze a big batch of soup/stew instead so there is more than enough to feed everyone and nobody feels like they're eating my special postpartum meal.
Our photographer arrived at the same time as our midwife (they were the same distance away) and, as far as I remember, stayed pretty much as long as the midwives did after the baby was born. She birthed her own sons at home with my midwife before photographing my birth, so she and my midwives were very comfortable with each other, joking and laughing and having a great time, and she was comfortable with the natural birth part of it. She was very unobtrusive and good at blending into the background. I barely noticed her and she got so many good shots!
The thing I really appreciated is that, in addition to still pictures, she actually took a brief video of baby crowning. I had no idea she was going to do this, but I'm really glad she did. I would never want my whole birth videotaped, but that's a really awesome thing to have live video of, I think. I also appreciated that she made an effort to get pictures of the grandparents holding the baby even though I was way too out of it (and busy getting a few stitches) to think of suggesting it myself.
JaiMaMaV - I also got my photographs for free as long as I let her and my midwives use the pictures for their promotional materials. The apprentice midwife ended up using one of my pictures as her logo and it is really strange to see me and my baby on her business cards and pamphlets, but it was so worth it!