I have been using Kodak Royal Supra 400 for air photography since it came out and thought it was well worth the extra money. It is now being discontinued and I am wondering what to switch to when my present stock runs out. I need the 400 speed as the aircraft vibrates so much and I need to use neg film because of its willingness to forgive exposure errors, but the higher the resolution and finer the grain the better. Unlike most people, I don't care about flesh tones (you don't see much flesh from 2,000 feet), but the ability to distinguish between subtly different green, brown and yellow tones is vital. Does anyone have any suggestions as to what I should try?