Back to the question of camera shake - stability and its effect on image quality. The dilemma is clear - most wildlife photos are taken at reduced light levels - game drives go at dawn and dusk. Long lenses are most useful, but fast long lenses are expensive and bulky.(My 300 mm. F2.8 is a real hernia risk!) High ISO films or elevated ISO numbers on digital cameras affect quality with grain and noise. IS cameras/lenses are a great help, but photos from a vehicle need more stability. I had previously recommended bean bags as an assist - monopod could work as well, but tripod, IMO, is not practical in a vehicle - no room for 3 legs on the floor! There is a matter of game drive vehicle etiquette (SP?) - when photos are being taken, to tell others when "body relocation" is about to happen! It is amazing to see the effects when a person shifts significantly in a land rover - the image in the viewfinder moves all over the place! If standing is allowed (not in the presence of predators) A simple "I'm moving" warning will be appreciated.