Originally Posted by creampuff 
But before you buy one, best to know the differences between incident and reflected light metering. If you are on a tight budget, use a DSLR's meter to assess exposure as you have the benefit of the LCD to check.
Sorry to be a pain asking this question
but could someone give me a brief definition of the difference between incident and reflected light metering. I am guessing that incident light is 'pure light' before it 'reaches' the subject. If so, I cannot understand why it would need to be measured.