B+W TOP-POL Linear Polarizer (52mm) lens mount_Nikonos Vivitar extension tube set for

Vivitar extension tube set for Nikon F with 12mm

so Spotmatic users will want to avoid this one

and will be optically clear

Includes one hex-type quick release plate with a 1/4" fitting

but you can see where someone has wiped it down with something they probably shouldn't have

B+W TOP-POL Linear Polarizer (52mm) lens mount_Nikonos Vivitar extension tube set forB+W TOP POL Linear Polarizer for 52mm filter threads. A high quality polarizing filter to reduce glare and reflections. Note that a linear polarizer like this one may interfere with the autofocus system of a film or digital SLR. Image is for illustrative purposes only. Actual item may vary slightly.