Thanks for the reply. Yeah, I discovered the live view thing soon after getting the 5DII. I have since avoided its use most of the time, but sometimes need it when aligning the polarizer over the ND400 filter for daytime long exposures. I stay clear of it after good focus is set for astro work. I have had a bit of success with IR daytime work at 2min iso400, but only via dark frame subtraction. Even though I plan to convert my current 5DII to IR, dark current noise is important to me with my work. I'm hoping the 5DIII is an improvement in this area.