I'm not sure if this is the right place to ask but here go. I want to take group picture with my class at school. So I'm gonna be using timer cause I want to be in the picture too. I'm hoping it'll be 50 people or so. I think that lighting condition would be 400 iso, 1/30-1/50 shutter at 2.8. I want to cut the iso to 200 since my digital camera get pretty noisy at 400 but do you think 1/25-1/25 shutter would be too low and might ending up getting some motion blur because people just can't really keep that still??? What would is lowest shutter speed you would use in a situation like that?? I mean, I have taken self portrait without obvious motion blur by setting the shutter to 1 second but for some reason, I think that was kinda lucky and it's easier to do when it is just me. 50 people could be interesting. Hopefully someone can help me out, thanks in advance.