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Celestron 1.25 Moon Filter for Telescope - Black

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RRP: £15.00
Price: £10.00 & FREE Delivery in the UK. Details
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  • 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"
This item’s packaging will be visible when delivered and cannot be gift-wrapped.
£10.00 & FREE Delivery in the UK. Details In stock. Dispatched and sold by Amazon in certified Frustration-Free Packaging.

Frequently Bought Together

Celestron 1.25 Moon Filter for Telescope - Black + Philip's Stargazing: Month-By-Month Guide to the Northern Night Sky: 2015
Price For Both: £15.99

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Product details

Product Packaging: Frustration-Free Packaging
  • Boxed-product Weight: 41 g
  • Item model number: 3A150486
  • ASIN: B00DQR93LG
  • Date first available at Amazon.co.uk: 12 Jun. 2013
  • Average Customer Review: 4.2 out of 5 stars  See all reviews (186 customer reviews)

Product Description

Customer Package Type: Frustration-Free Packaging

Product Description

Celestron's 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 1¼" filter. Transmission is about 18%.

Eyepiece filters are an invaluable aid in lunar and planetary observing. They help to reduce glare and light scattering, increase contrast through selective filtration and increase definition and resolution. They also help reduce irradiation and lessen eye fatigue. Celestron's filters are made of high quality, solid plane parallel glass with excellent homogeneity. They are anti-reflection coated, to prevent glaring and ghosting. 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, so they can be stacked in various combinations. This allows you to create different color combinations and transmission characteristics, or to have the same color characteristic, but with a lower transmission. When stacking color filters, the effective transmission of the combination you create is equal to the product of the spectral transmission of each of the filters used.

The clear aperture is 21mm and the transmission is about 18%. Moon Filter is 1-1/4". The effectiveness of the filters depends on several factors, including: the aperture and focal length of the telescope, the magnification being used, and seeing conditions.

Box Contains


1 x Filter

Customer Questions & Answers

Customer Reviews

4.2 out of 5 stars

Most Helpful Customer Reviews

24 of 24 people found the following review helpful By Jim Roche on 8 Jan. 2011
Product Packaging: Standard Packaging
I bought this as a present for my niece, along with an entry level telescope.
She says that looking at the Moon without the filter is too bright, but with
the filter it it looks fantastic, and every detail can be made out and apprciated.
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20 of 21 people found the following review helpful By Peter Lee TOP 1000 REVIEWERVINE VOICE on 2 Feb. 2012
Product Packaging: Standard Packaging Verified Purchase
First impressions aren't good... The filter arrives in a padded envelope, inside which there is a flattened plain white box featuring a Celestron label, containing a ziploc plastic bag with the filter within. The delivery note advises that this is "eco packaging", and to be fair the filter itself is undamaged.

Your money buys you a small plastic disc, an opaque core surrounded by a black border with the word "moon" on one side. The rear of the disc has screw threads, and what you have to do (the filter comes with no instructions) is simple: 1) screw it into the bottom of your chosen eyepiece for your telescope, 2) put the eyepiece into the focus tube, 3) look through it.

So does it work? Without the filter if I look at the Moon through my Celestron Astromaster 130EQ using the standard eyepiece the Moon appears rather too brightly to identify features, and after a few seconds I feel the need to look away, as though I've been looking at a light. With the filter the difference is incredible, the contrast improved and the light dimmed comfortably, and I can now see the rims of craters on the Moon, plus if I look at Jupiter I can just about make out cloud systems on the surface if I focus carefully.

For such a small, cheap, flimsy-looking thing it makes an incredible difference. An essential item for the budding astronomer.
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64 of 69 people found the following review helpful By Silverbullet on 7 April 2009
Product Packaging: Standard Packaging
I never look at the moon without using a moon filter, it's just too bright otherwise and I find it hurts your eyes, especially when there's a full moon and it is exceptionally bright. More detail can be seen using this filter as it takes away that dazzling brightness that hinders observation.

If you haven't got a moon filter already you should look at investing in one as they aren't particularly expensive (in comparison to most other astronomy accessories!).
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58 of 64 people found the following review helpful By Kim on 10 July 2009
Product Packaging: Standard Packaging Verified Purchase
The moon filter is a small attachment as you will imagin being made to fit a 1" + 1/4" lens. I am a compleat beginer so didn't know the filter screwed on to the bottom of the lens that being the shiny bit that goes into the telescope. So for a while it was sitting on top of the lens falling onto the floor every time I touched the eye piece, in the dark and behind the flower pot, I always managed to find it gave me new confidence in my night vision. I explained this to my seller he said what to do but I still didn't get it, till an experienced astronomer at the astro club had to show me, and assured me that it wouldn't fall into the telescope, and thats how you fit the other filters. Celestron Moon Filter Mine is, and I can recomend the £3.99 one and it is good.
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6 of 6 people found the following review helpful By Steve on 22 Mar. 2014
Product Packaging: Standard Packaging Verified Purchase
Bought it as it was 'recommended' for the Travel Scope 70. But it does not fit - there is no thread on the eye piece.
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5 of 5 people found the following review helpful By Richard C on 25 Jan. 2013
Product Packaging: Standard Packaging Verified Purchase
I am a complete novice to astronomy and bought this item to go with a recently purchased Celestron 114EQ telescope. It does exactly what it is intended for.
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10 of 11 people found the following review helpful By Mr. Brian Mounsher on 31 Dec. 2013
Product Packaging: Standard Packaging Verified Purchase
ordered this to go with a Celestron Travel Scope as it was recommended to add to order to view the moon too lessen the brightness of the moon, the trouble being it does not fit on the scope, you can see the difference it would make if it fitted
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1 of 1 people found the following review helpful By tomtheoraclerobinson on 28 Feb. 2013
Product Packaging: Standard Packaging Verified Purchase
This is a good filter for its price. You're not paying that much, and it does reduce the brightness of objects, whilst also improving contrast. It also fits in well to my Celestron 1.25" lens. As a beginner, i didn't want something too expense as i didn't know if i would needed. I would HIGHLY recommend buying a filter, the glare of the moon (the first thing most beginners will look for as it's easy to spot) is far too bright to be able to look at for long periods of time. However if you are a beginner and want a cheap filter i'd get this one instead "Light Blue 1.25" Telescope Filter - (73% transmission)" Type it into amazon and it'll come up. Not only does this fit my lens equally as well, but it's got a wider aperture and better transition. Not only this but it is better for looking at other objects such as the planets and doesn't give an unpleasant green tinge, but instead a more subtle pale blue tinge. Plus it's only a few extra pounds which are well worth paying. If you're serious about astronomy, and have spent in excess of £500 on a telescope, i'd say don't cheap out on a filter, it's worth paying the extra as there's no point spending all that money on a brilliant telescope to have the image ruined by a poor filter.
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Customer Package Type: Frustration-Free Packaging