One of the biggest problems for the Urban Astro Photographer is the amount of light polution that is now very evident around all of the major towns and citys within the UK.To try and combat the effects this has on astro photography i have purchased an Astronomik Visual CLS Filter from Bernard at Modern Astronomy which now means i can get exposures up to three or four minutes in length without them being so over exposed that any detail is lost.
The Astronomic filter is a clip in broadband light pollution filter which works on all objects for both visual and imaging use.
It blocks Sodium, Mercury and air-glow emissions and can also be used as an effective minus violet filter by refractor owners and also these are not UV / IR blocked.
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