Nikon SU-4 brand_Paul C Buff 0 10BL 1000X is a

0 10BL 1000X is a high quality neutral density filter with 10 stops of neutral density

this lens is clearly not meant for day to day shooting: it produces a circular image in the middle of the frame

with minor wear on threads and mounting surfaces

The Nikon SB-28 is a solid

6 scrims (single & double for each light)

Nikon SU-4 brand_Paul C Buff 0 10BL 1000X is aThe Nikon SU 4 is a handy little TTL flash accessory that clips into any Nikon TTL flash and accepts communication from any SU 4 compatible Commander flash. Can also be used in non TTL remote mode. Doesn't need batteries, takes up almost no room, does something real helpful, and they're not making them any more perfect. But hey, here's one now!