I've got a D200. I understand 'LO' appears when you're in shutter priority and you exceed the widest aperture. But I'm in Aperture priority, and sometimes if I'm pointing somewhere dark, it will say LO even when the exposure is as little as even 1/3 a second?! And other times when I'm pointing at a lighter area I will set the aperture and it will be happy to expose 10", 20" etc! The only way I can get a shutter reading is if I pop the flash in 'rear' sync and then it shows me the true shutter values instead of LO - for example I've just popped it and it now says I need a 10 second exposure at 3.5 .... why can't it just tell me this? It's not like the exposure if larger than 30 seconds?!