Neutral Density filters that are genuinely neutral - they reduce brightness without affecting colour. 

Select a low density for use with smaller aperture telescopes and a higher density for large apertures.  

Perfect for reducing the glare of the Moon and planets.

NB: These are not suitable for observing the Sun! 

This variable polarizing filter made from anodized aluminium and optical glass allows you to progressively reduce the amount of light entering your eyepiece.

Reduces glare whilst increasing contrast so perfect for observing bright objects such as the Moon or certain planets.