Anyone else using a 5D body for shots? Ever have this problem? I originally meant to use ISO 100 in this one but a bout of shivering must have overcome myself and I ended up shooting this at ISO125. Are the intensity variations of the brightest stars due to the algorithim in the chip boosting the 100 upto 125? Or is there an atmospheric transparency variation that only effects bright stars? I am really confused on this as the faint stars do not show any of the *pulses*.
Shot with a Canon 5D, ISO 125, TV 1999sec. (33+minutes), AV 8.0, Lens 24-70mm @ 43mm, no filters, single exposure, noise reduction on