this will be my first opportunity to lean out of the window and shoot what's below. Does anyone have any experience or advice? I'll take my Canon 5D and a 24-105 f4 lens (my only one for that camera) and also may bring my Sony Alpha 100 with an 18-70 kit lens. The Sony isn't a full frame sensor so the 18mm setting is really no wider than the 24mm on the Canon so it may get left behind. The only tip I've received so far is that we'll probably be at 1000' or slightly less and I can ask to go higher if needed for a wider view. It should be fun but I also want to get some nice shots so will appreciate any thoughts you can share.
a) Don't brace against the airplane, lots of vibration there.
b) Don't get the lens so far out you get slipstream buffeting...vibration again.
c) Shoot with a fast shutter and small aperture (but you already knew that).
d) Higher altitude produces less apparent motion across the frame.
e) If you really are going to be holding the camera outside the plane, make sure everything is secure.
f) Don't shoot through the plexi windows, use a slider if the plane has one.
g) If plane doors are removable, take them off for the shoot; that may allow you to shoot from inside and have a wide field of view.
h) If doors are off and the plane has only the old style car seat belt buckle (like most current commercial aircraft) or has the military-style latching lever (ball bearing detent), duct tape the buckle lightly so it cannot be snagged with a sleeve or camera strap and inadvertently opened. Don't tape it so heavily it can't be opened in an emergency. It's bad form to fall out of a banking airplane with no doors.
i) A sustained 30-45 degree bank will reduce ground motion to a minimum as you circle a point of interest. However, you will feel the Gs, and looking through a viewfinder while doing this may reveal any tendency towards airsickness or vertigo.
j) If not circling, a polarizing filter may be of some benefit, especially since you will have a lot of water in the view.
k) Have fun.