OM System BMF-LPC01 Body Mount Light Pollution Filter

Street lighting emits at specific wavelengths, and those spikes are what turn a long exposure of the night sky into an orange gradient. The BMF-LPC01 notches them out, so nebulae and constellations record against a neutral sky instead of a city cast.

It mounts behind the lens at the body rather than on the front, which means one filter serves every lens in the bag including the ultra-wides that take no front thread. The effect is strongest near the horizon, where the light path through polluted air is longest, so it earns its keep on constellations rising in the east or setting in the west.