Hoodman is now offering an updated version of the original loupe! Check out the options for this awesome tool. I love my loupe and eyecup because the loop helps you see your images through the viewfinder MUCH easier out in the field -- blocking out the sunlight and glare. The eye cup also help you see your exposures and the details in-camera while you're shooting, blocking out ambient sunlight.
Through this link you will receive 10% off these products via Hunt's Photo and Video.