Hi Ronald,
You're not particularly close to the action at La Ferté, long lenses will generally work fine.
I don't like the treeline you tend to get in the background, so I try to catch the aircraft in the landing on the left side or after take-off on the right side.
Still, it's a nice event.
Are you referring to the Parc de Découverte Aeronautique in the town of Albert? Can someone confirm that it is actually open to individual visitors on Saturdays? I've never been able to get in.
You might also like the Hurel-Dubois HD-34 which can be photographed at Creil.
http://www.airliners.net/photo/IGN---In ... c0d02db96a
Close to La Ferté there's a Mirage preserved at Buc.
http://www.airliners.net/photo/France-- ... 362776c9c7
Peter:)