LCDVF 3.2" Loupe for D800

Very impressed with mine only downside is no dioptre adjustment not a problem for me as I always shoot with my glasses on.

You attach the mounting frame the same way as the Nikon plastic LCD protector , the loupe has 4 powerful magnets that align the loupe perfectly every time.

http://www.kinotehnik.com/products/lcdvf/overview