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Filters.

Filters can enhance the viewing experience by bringing forward the details of the object being viewed.


The coloured Wratten filters are particularly good for highlighting aspects of the planets.


Other filters are used to filter out certain wavelengths.  Light pollution is the most obvious one for many of us living in the orange glare of street lights.


Moon filters help reduce the glare of the moon which can be quite tiring on the eye.  These are neutral density which means they reduce the light across the entire visible spectrum without changing any colour.  Some people prefer the polarising filters as they are infinitely adjustable so you can get the most comfortable amount of light transfer to suit your own taste.


Remember, no filter can actually brighten an image - they can only reduce the light passing through.  It is the perceived difference in contrast brought about by the filter that enables the brain and eyes to interpret the image in more detail due to the effects of the filter being used.


A filter wheel lets you switch filters in and out of the light path very easily so that you can try lots of combinations of eyepieces and filters with very little effort.