Maybe someone can help me figure this out. My 2nd seems to have quite a bit of trouble with her flash. She's wondering if something is wrong with the flash. I've been trying to help her troubleshoot and it came out before the last wedding that the batteries aren't usually changed until the flash won't fire. I was planning to use her flash and see what results I would get, but when I heard she just doesn't changed the batteries I thought the problem would be solved and I didn't take her flash. When I downloaded the pictures I was very surprised to see the dark images compared to mine. Especially as we used almost the same settings for the images. We also recently went to Neil van Niekerk's flash workshop and it was great. I showed her these images and asked her if she had dialed the flash up or down at all during the day / night. She says she did not have it dialed down for these indoor shots. I was wondering if she had forgot and left it dialed down after doing some fill flash outside earlier. If you have any insight I'd love to hear it as I'm pretty confused. It seems to me as these settings are almost the same there should be more ambiant light in her photos. Both these images are SOOC. We also both use Canon 580EX II. Thanks.