A 1.7x teleconverter is used on the 75-300 mm lens allowing a maximum of 510 mm. Both lenses use a 1A skylight cross screen filter to absorb UV and prevent excessive bluishness. On very hazy days a yellow light coral filter to improve color rendition which also works well indoors at museums under floresent light. I use Kodak gold either 400 speed normally or 200 speed on a really bright day. The faster the film the more grainy the pictures, so I try to use the slowest film and still not blur.
Aerial shot require a lot of light, timing, and the ablity to hold completly still.
The autofocus sometimes is just not fast enough. A tripod is not used and I don't know why I carry one other than to hang stuff from.