In perfect condition for sale a Astronomic profi CLS pollution filter.
This filter has been sold.
Sales blurb from Bintel here:
Astronomik filters are in a class by themselves when compared to other filters made by Japanese and US manufacturers. The coatings are completely sealed and insensitive to moisture. They keep their transmission characteristics indefinitely. The coatings are so hard that is it not possible to scratch them by mistake. You would have to rub them with sandpaper to get even the finest of scratches! Due to these outstanding characteristics, Astronomik gives them a 5 year guarantee. Each filter will be sent in a useful protective case.
The Astronomik CLS filter is an inexpensive solution for visual Deep Sky observation and for B&W photography and CCD imaging. The CLS filter gains contrast for most objects under light-polluted suburban skies.
The Astronomik CLS blocks the emission of Hg and Na streetlights as well as all Skyglow-lines . All major emission lines from deep-sky objects are passed without surpression.
Optimised for telescopes between f4 and f15 focal ratio.
Specifications:
* Threaded to suit 2" eyepieces barrels
* High transmission of nearly 100% between 450nm and 530nm
* transmission of no less than 96% at H-alpha
* total blocking of all unwanted light from light-pollution
* the ideal allround filter for deep-sky observing, even with small scopes
*resistant against high humidity and scratches
* highest optical quality on the market
$309 new, asking price for this filter is $200
First in best dressed
