How do I get the right focus point for fast jets?
Jason Pountney, via email
Chris says… It sounds like your problem is depth of field. Are you using your 70200mm f/2.8 wide open? If so, try closing the aperture down to f/5.6 or f/8, and if this means the shutter speed is too low, increase the ISO to compensate.
If you’re happy with the depth of field and just want the camera to focus on the right thing, such as the nose or the cockpit, you may need to experiment with your choice of autofocus point. Dynamic Area AF mode is ideal for moving subjects, but although most people use the centre AF point, this isn’t always the best choice – this could be why you’re getting the centre of the aircraft sharp and not the nose or the tail. Instead, think how you compose your shots and where the nose or cockpit will be in the frame, and move the active AF point over this spot instead.
Dynamic Area AF mode is best for moving subjects, but your AF point doesn’t have to be in the centre
of the frame