Kings Troop Royal Horse Artillery

The ancient ceremony of 'Beating the Retreat'on Horse Guards Parade off Whitehall, London -- here one of the Gun Carriages arrives -- these are the guns which are used to fire 'Salutes' for Royal Birthdays .I used my 100-300mm f4.5-5.6 SMC Pentax-F lens off my MZ-5 on my K10D.