Nikon Type E focusing Screen
The Nikon type E Focusing Screen (grid) is an optional focusing screen for Nikon D3 SLR Digital Camera that provides for on-demand gridlines.
For more information about, Nikon Focusing Screen E for Nikon D3 Digital SLR Camera .
Customer Reviews on Nikon Focusing Screen E for Nikon D3 Digital SLR Camera
Review by colin hawkins, 15/08/2011, Customer Rating:

A vast improvement on the standard screen that comes with the D3x. Ability to get horizons & verticals straight using the grid lines. Useful for composition, landscapes & architecture. The faint grids are spaced far enough apart so not overpowering in the view finder. Easy to swap screens if necessary.
Review by Philip Davis, 21/03/2011, Customer Rating:

This screen is currently being offered at a very good price and is ideal if your interests run to architectural or other forms of photography that need the grid screen then this is a bargain at the moment.