I took a photo today of our church choir. It was inside with your normal church lighting. I used a D7000 with a Nikon 28-300 lens. I used a shutter speed was 10 and the aperture was 7.1 at 500 ISO. I used a SB-700 speedlight a shot through a white umbrella. The umbrella was about 10ft in the air. The photo came out fairly well but in Lightroom I could see quite a bit of grain and also got quite a few reflections on some of the choir's glasses. The photo was just not sharp.Any suggestions on how to improve this shot would be appreciated.