>>1250424> But is it really safe to have a fire this close to a tent?
Depends how big is the fire, if there are sparks etc. If you keep it small and don't add ton of firewood at once you should be fine> Are canvas tents more fire retardant?
Don't think so, depends on the material used if it's sprayed with some water repellent etc. > How close can I realistically get a small fire to the tent?
Just like on the pic... just don't make it big. Generally speaking most tents don't handle fire well, especially newer, syntethic materials but unless you do something really stupid you should be fine