The Haida M10-II Nano Coating Drop-In Clear Night filter has an aluminum mount.

The filter is excellent to use for evening and night shots in urban areas or, for example, Astro photography.
The filter blocks the spectrum in the light between approx. 580 nm and 610 nm of sodium lamps and mercury arc lamps, the yellowish/orange light is filtered away and there is virtually no light pollution, the result is a much cleaner recording.
This filter is provided with the excellent Haida Nano Multi Coating on both sides.