The 1.25" moon filter, consisting of flat steamed glass, is simply screwed into the eyepiece thread. It reduces the brightness of the moon and thus enhances the contrast in the observation. This filter is mainly necessary during the major moon phases, since the subjective glare of the moon is at its strongest and can quickly become unpleasant.
More than a normal moon filter
However, the filter doesn't only offer advantages during lunar observation, but it also allows for high contrast observations of planets. It amplifies the surface details that make observation particularly interesting. The filter is strongest in the red / blue range. Thus, objects such as the 'Great Red Spot' and the bands of cloud on Jupiter appear clearer.
A particularly disruptive factor during observation is the illumination of street lights. This is blocked in the conventional spectral range so that high-contrast observations are possible.
This premium moon filter is of a much higher quality than similar products: There are some cheap offers in this field where the image quality of the telescope suffers due to the filter.
The advantages at a glance:
|Connection (to the telescope)
|Coating of optical system
|Type of build