I have a family portrait to take soon. It's of 10 adults. Two of them are elderly so I don't want them to sit on the ground. It's just plain grass at the place I'm shooting at. My question is: Is it unprofessional to use studio chairs outdoors? I plan to cover most of it with another person. I also would like to use wooden stools. I've seen that before and it doesn't look horrible. But I haven't ever seen studio chairs.