As a doula and a birth photographer I am completely at ease at your birth space knowing what can help or interfere with the anatomy of giving birth.
At a birth scenario there are several moments when the best support we can offer to a woman in labour, besides being present, is stand back and give her some space. These are the perfect moments to capture the images that will show the environment and those that are also doing this beautiful and empowering journey with you.
It´s true that your partner or even the doula can take some photos, but having a birth photographer makes an huge difference in the quality you will get in the end (same reason why you don´t rely in your friends to photograph your wedding).
With a birth photographer that is also a doula I can assure you will receive quality and breathtaking images that you will be proud to share even with your child in the future.
My camera has a silent mode which allows me to take photos in even a more subtle way.