I have four focusing screens for the Nikon F, Ftn, and F2 professional film cameras.

　　- Type A - Matte/Fresnel field with 12mm center reference circle and (horizontal) split-image rangefinder.

　　- Type B - Matte/Fresnel field with 5mm and 12mm diameter concentric reference circles.

　　- Type E - Matte/Fresnel field with 5mm and 12mm diameter concentric reference circles, and (3) etched horizontal and (5) vertical lines. Ideal for architectural photography.

　　- Type H1 - Clear Fresnel focussing screen with microprisms over the entire field. Recommended for photography in poor lighting conditions. for most f/2.8 lenses