I've recently found out about Celestron filters [such as this one][1], which are meant to be used for telescopes, not cameras, but I would love to see examples of photos taken through these filters if anyone has ever tried this.
If you have used it yourself to take pictures, would you say that it is possible to use them for portrait photography or other types of photos than sky photography? (for example, portraits with strong stars in the background sky?)
Otherwise, maybe I'm dead wrong assuming they would be the right equipment, and in this case let me know what better suited filters would work for photography or even filming.


  [1]: http://www.celestron.com/browse-shop/astronomy/visual-accessories/visual-filters/oxygen-iii-narrowband-filter-2-in