My technique for shooting night time aerials hand held from a helicopter is to set the ISO to Auto, open the lens to full aperture, and control the shutter speed manually. I then vary the exposure when necessary by adjusting the +/- exposure control on the camera. I try to keep the ISO as low as I can, which often means using low shutter speeds in the 1/60 - 1/125 range. I am usually using wide angle lenses, and this helps to allow the slower speeds. Nonetheless, helicopters, especially with the doors off, are vibrating quite a lot. To protect myself against motion blur, I choose a high frame rate and keep the shutter pressed for a long time to guarantee that at least one of the shots will be steady enough. Kind of a crazy techniques, but it works most of the time.
I usually try to use wide aperture primes of f/1.4 whenever I can. This helps keep the ISO down. On this occasion I was shooting Miami from the air for the first time and didn't know what to expect so I packed short zooms with their f/2.8 apertures on my cameras. This gave me a range of about 24-70mm focal lengths, but caused the ISO to get up in the 3200-6400 range -- not where I usually like to be. Had I used my f/1.4 primes, I could have knocked two stops off the ISO by working at 800-1600 maximum instead. This makes a huge difference in image quality and sharpness.
My thanks to FlyNYon Miami for helping to arrange the scheduling for this flight. I have used their services in NYC and now am using them again in Florida.
On September 9th, I will be conducting an "Over Miami - Aerial Photography Workshop" for the Leica Academie. If you'd like to join me, you can check out the details here.