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

Waas up: 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 & P and DOW futures are in line. What gives?

Answers and Views:

Answer by Oh Boy!
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

Answer by dinertime444
Nazdaq 100 is better because 100 is better than 0