I just noticed some Nikon waist level viewfinders in the classified section. They seem specifically tailored for the F5. Will they work with the F100? Is there a similar product that will work with the F100? I had no idea that such things existed for 35mm SLR cameras - I'm really quite excited! I tend to shoot a lot of street and subway photos and a waistlevel would allow me to be a lot less obtrusive.