I got this lens at the end of 2009 along with my current camera (50D) and my first telephoto zoom, and it's served me pretty well. However I notice a strong tendency toward chromatic fringing, and a pretty shallow depth of field (for airplanes, most of the nose and fuselage will be in focus, but I will start to lose it around the tail.) Usually I have been shooting around f7.1 to f8.0 in manual exposure for that. Recently I tried changing that to f10 or f11 and it seems to help, though at the expense of a bit more grain as I had to increase the ISO to compensate. Anyway, I guess I'm asking if any of you all have used this lens for aviation photography, and if so, what settings work best for you. Also, if I was looking to "upgrade" from this lens in some way, is there anything out there that you find is much better?
Thanks for your advice!