well my uncle mark sent me a gift for an early christmas gift. but any way he gave me a lense that comes with it and a really big lense say 7 inches long. but im confused with some of the things on the camera i know the basic stuff like focusing and that but there are 11 different shutter settings such as b,1,2,4,8,15,30,60,125,250,and 500 and im not sure which one does what so can any one help? and how much is this camera worth cause its like mint