Why is there such a disconnect between nasdaq futures and the actual index?

As far as I can tell there has only been a difference in the futures and closing price when futures drop or rise after hours. For the last 4 months or so there has been a consistent 300 point difference in the futures from the nasdaq index. S %26amp; P and DOW futures are in line. What gives?|||The futures are on the NASDAQ 100 while the most often quoted index is the NASDAQ composite which is a different index.





You're comparing apples and oranges|||Nazdaq 100 is better because 100 is better than 0