Back in the day you were a real photography geek if you had a B&W viewing filter. What it does is simulate a scene as if it were taken with black and white film. It is not just a neutral density filter. The filter alters the contrast so that you can visualize the scene in B&W. They come in gray and a yellow, similar to a K2 black and white filter. Today with digital you can just take a photo and have the preview simulate B&W. The purpose of the filter is to train your eye to better visualize a scene and determine what will work at what will not work. You could shoot everything and delete later but this filter helps you grow as an artist. Do you have to use this filter? You certainly do not but it is worth a try to see if it helps.
Viewing Filter