I will be taking a family photo this weekend. Its a big event (Mom's 90th!!) and my family has asked be to take the group shot (66 people). I know I am going to have problems with lighting this shot with the higher f stop I will have to use to keep everyone in focus. My goal is going to try to just get that histogram so it is not clipping on the black end (shooting in RAW). As long as I can accomplish this, I should be able to correct the underexposure in light room without any loss of quality since all the pixels are present. Is this an accurate statement?? (I know how to use the Develop module pretty well in Lightroom, I am mostly concerned here if there is any significant loss in quality of a photo when changing the exposure if you have all or most of the pixels present. Seems like it shouldn't but I thought I would check here for confirmation).