Toni el Khazen

Hi to all, i need your opinion on the following matter: i have a scene in which the actors are near a campfire. i am using the Kodak 500t vision 2 and need to know what is the best exposure to work around to have details in the flames. Assuming it's a strong campfire what is the ideal exposure to avoid blown out flames. note that i will add lighting on the actors to work safe on the fire. thanks