I will be shooting a family with no flash and natural light... outside or in a very bright room with many windows. I have both a 24/70 and 105 prime lens. I usually shoot aperture priority and normally focus on one individual in the portrait. Outside I normally shoot 4.5, but I don't have much experience shooting more than four people in a group and getting the same result I'd get with just one person, which is a beautiful portrait with a very nice blurry depth of field in the back. Any tips would be appreciated on how to get the best family portrait shooting in natural light with the noted equipment. I've been told that when you shoot a group of people you don't want to get lower than F8. But when I try that, I don't get the blurry depth of field I normally get with F4.5. I have a tripod I can use, but I'm just trying to get an idea where to start from. I don't want to get a pocket camera kind of photo, and clearly I need all four people in focus.