Fortunately this work was done for free and I wasn't being paid. I was assisting the wedding photography with my Nikon D3300 and was using a prime 50mm 1:8G. 90% of my outside shots were great and in good focus but less than half of the inside shots were in focus. I previewed every shot after taking it and if I didn't think it was in focus I re-took the shot. Looking at the preview screen they appeared fine but after opening them on my computer I can see that they are out of focus. There were some times when I couldn't get the lens to focus. I have it set to M/A and would adjust the focus ring then let the shutter do the auto focus but some shots just wouldn't focus. Changed from Apeture to Manual to Shutter even Auto with no better results. Adjusted ISO because I was limited with the flash but just couldn't find anything that worked. Got frustrated and ended up switching to Auto (Yes I know this is a no no for professionals). Yes I am a beginner when it comes to DSLR shots on the inside. I took the same couples pre-wedding photos by the railroad track on a cloudy day and they look great. Maybe I just need more training with the settings. When I finish processing them I will show a few of the outside shots compared to the inside.