فلتر ضوء اسود اللون مقاس 2 انش بتقنيتي UHC/LPR للحد من التلوث الضوئي وضبط شدة التباين للاجسام من سيليسترون

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Stephen5.0:
Arrived quickly. Came well packaged in solid plastic case for keeping this filter clean and scratch free. A good basic filter add to any set-up. I normally only deal with a reputable ‘local’ telescope dealer/specialist for accessories but this was in stock – and a significantly better price point.

pete Willmann4.0:
When using this filter for visual viewing does darken the background in light polluted skies making some nebulas easer to see. If using it with a DSLR it has blue color in the picture it take a lot of work to clean that up in post processing. I have found that if you process in black and white it works much better.

Sir Reginald4.0:
This (and most other celestron band filters) are actually rebranded Baader Planetarium filters. You can compare pictures of these to ones from Baader’s website and see that they’re exactly the same not to mention that the back of the plastic casing on these literally says “Baader Planetarium.” As for how these work they do a decent job of filtering out light pollution (I live in a horribly light polluted area outside a major city) but they can’t work miracles and they add a blue tint to everything you’re viewing. Also note that like it says in the description these are best for viewing nebulae and unfortunately will dim out any galaxies you’re viewing but these weren’t designed for galaxies. As far as I can tell these are flawless and don’t appear to be factory rejects seconds or QC rejects from Baader so I suspect it’s simply a bulk distribution deal between Baader and Celestron. Overall these are a real bargain for the price and work well for those of us who live in cities and don’t have the time to travel to beautiful dark skies.

Nando4.0:
I will do a technical review since most practical ones are already given. Regarding construction I was surprised that the filter glass was loose inside the metal rim so one star less due to that. Attached is a picture of the open package. The filter blocks A LOT of light. Attached are two pictures of Altair without and with filter you will see that filter cuts around 75% of the light as I can see by exposure and gives a blue tint to the stars. I also measured the UV-Vis absorption spectrum in our laboratory spectrometeryou can see that only bands between 450-520 nm and 626-673 nm are allowed. This cut can be observed in the attenuation of light from a fluorescent lamp and white from my computer screen which are also attached.

Alfredo5.0:
I use a 4″ telescope in urban skies. There is nothing written about this filter other than adknowledge of it’s existance by filter gurus in the amateur astronomy web comunity. Bottom line it does a beautiful job. Otherwise invisible objects in urban skies become magically visible. Summer nebulae M8M16M17and M20 get an amazing enhancement a couple of them really amazing from nothing there to wow!. M27 and M57 are not “prettier” but i would say ” more comfortable” to see. I own both a UHD and OIII lumicon filters but they are too harsh on small telescopes in urban skies. For thatI recommend this cheapo Celestron LPR. Do not be confused however!. Phil Harington lists this filter as a narrowband in his book. It is a broadband. And it works. Save your money if you have a small telescope in poor skies this is the filter for you. Use low power. I used it from 16x to 40x to wonderful result. At 60x not so good. Happy viewing asn clear skies!

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