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Celestron 94119-A 1.25 Inch Moon Filter
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- Celestron's Moon Filter is an economical eyepiece filter for reducing the brightness of the moon and improving contrast
- Greater detail can be observed on the lunar surface
- The clear aperture is 21mm and the transmission is about 18%
- Moon Filter - 1-1/4"
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The Moon has the distinction of being the most often viewed celestial object through backyard telescopes. It is undoubtedly beautiful and mysterious, and is one of those constants in our lives that connects us to every other being on our planet. Regardless of who we are or where we live or travel, we all look at the same moon. It is difficult to look at the Moon through a telescope and see all of the details due to its brightness. Our eyes are not ready for the bright beam of light that emits from the eyepiece, and they “stop down”, just as they would when you step out into the sunlight on a bright summer’s day. When we’re in the sunlight, we often wear sunglasses. They help us relax our eyes, protect us from glare, and help us see things more clearly. When amateur astronomers observe the Moon, we use a moon filter. A Celestron Moon Filter provides similar benefits to those of sunglasses...our eye relaxes and opens up to let us see more detail. This is especially important when observing the Moon when it is near full. The Celestron Moon Filter simply screws onto the insert barrel of most 1.25” eyepieces. It only takes a second or two to transform your regular eyepiece into one suited for lunar observations. A Moon Filter is also helpful when observing Venus or bright terrestrial scenes. This filter is not suitable for viewing the Sun.
Celestrons Moon Filters are economical eyepiece filters for reducing the brightness of the moon and improving contrast, so greater detail can be observed on the lunar surface. The clear aperture is 21mm for the 31.7mm filter. Transmission is about 18%
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So, it does what it is supposed to do, it darkens the moon, although it gives it a greenish tint which I don't particularly like, but most moon filters give a color tint anyway. It is a poorly made plastic that holds the filter, so they could not have been cheaper when making this, and it's a shame, but I can't say it will break easily or anything like that.
Oh, don't just go out and buy a moon filter if you don't actually need it - make sure the glare of the moon does bother you first. And a little hint: sunglasses also work, just remember to take them off after viewing the moon ;)
Fits perfectly onto the bottom of any 1/25 thredded eyepiece or if you remove the x2 lens on a Barlow for Astrophotography - see my pictures.
Two pictures added to this review. 1: The Moon without the Moon Filter and 2: The Moon with the Moon Filter. Both taken at the same x30mag setting using my Canon DSLR in the Prime Focus Method on telescope.
"...All eyepiece filters are threaded to fit Celestron's, and most other manufacturer's, 1¼" eyepieces. They offer a full 26mm clear aperture. Celestron filters are mounted in black anodized aluminum cells with the Kodak Wratten Series Number individually engraved. They also come with a plastic case for safe storage. The cells of each filter are double-threaded,..."
Most other manufacturers does not include Seben, the filter was mounted in plastic not aluminium, there were no Wratten Numbers, there was no plastic case and the filter is not double threaded.
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