If it's a typical sunny day, I always use ISO 100. With the aperture around f/7.1, that will give me shutter speeds in the 1/400 - 1/800 range, more than enough for capturing airliners. At worst, I'll bump it to ISO 200. You don't need to be at ISO 640. And I don't like to use intermediate ISO values either - I still with "standard" values (100, 200, 400, 800, etc.) From what I've read, using values between those, the camera has to extrapolate the value, and can result in more noise than a higher, standard value.



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