A vari-zone scope adjusts to the exact speed of your crossbow (even if you don't know your speed) and removes the need to hold over that you experience with most other scopes.

Example: when shooting my Horton (yes HORTON) with the stock lite-rite red dot scope I had the 20 yard dot dead, but the 30 yard dot was low. So I was using the 40 yard dot at thirty and holding just slightly low. At 40 it was holding over with the 40 yard dot.


http://www.excaliburcrossbow.com/demo/m/content/article.php?content_id=98

Mitch