Hi, it helps with observing DSO's (nebulae, galaxies, star clusters) by blocking some of the typical types of street lighting. Check it out:
http://www.astronomik.com/en/astronomik_cls_filter.html
It's $99 at Bintel
https://www.bintelshop.com.au/Product.aspx?ID=6534
The Lumicon one in the package is similar, but better
It's $199 at Astro Shop:
http://www.myastroshop.com.au/produc...sp?id=MAS-020A
Quote:
Originally Posted by Julian
interested to know what a CLS filter is? regards Julian
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