B+W magicpol BLAU Blue Colour Polarizer (55mm) brand_Kinoflo A powerful

A powerful

this 45mm extension tube will provide a fair bit of extra magnification

This Nikon drop-in gel filter holder fits the Nikon 600mm f4 AF Nikkor lens and other lenses which use 52mm-sized drop-in filter holders

but it's a pretty capable all-in-one if you need the zoom range

B+W magicpol BLAU Blue Colour Polarizer (55mm) brand_Kinoflo A powerfulThis B+W magicpol GRN filter for 55mm filter threads is a unique colour polarizer that shifts from light blue to dark blue. To achieve this effect, a polarizing filter should be mounted in front of the magicpol filter; the effect is then achieved by rotating the polarizer (polarizing filter not included).