lesson 2

shuttter speed 
how fast the shutter speed oipens and closes to let light into the camera

aperture
how big the opening of the lens is to let light in


shutter speed is usually expressed in fractions of a second

1/250th of a second is fast
1/30th of a second is slow

anything slower than 1/30th of a second MUST! use a tripod


aperture is usually expressed in f numbers

f/2.1 is large
f/22 is small

depth of field is best described as the amount of the picture is in focus