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Astro Eyepiece filters.

Online Catalogue  | Astronomical Accessories | Astro Eyepiece filters.

HYDROGEN-ALPHA CCD FILTER (1.25") HYDROGEN-ALPHA CCD FILTER (1.25")
This long-pass filter limits transmission of light with wavelengths longer than 650nm. Whilst suppressing all other polluting lights, the filter allows you to observe emission nebulae with greatly enhanced contrast. Ideal for observing emission nebulae or objects that emit in the H-alpha region. Suitable only for CCD photography.
OVL CODE 20210

Price: 49.99



UV/IR CUTOFF FILTER (1.25") UV/IR CUTOFF FILTER (1.25")
This UV/IR cut filter blocks UV and IR rays to maintain the color temperature you want, eliminating false colour fringes around bright stars. Offers a 99.9% light transmission rate for bright and clear images. Suitable for visual observations and for CCD photography.
OVL CODE 20208

Price: 39.99



L-RGB CCD FILTER SET (1.25”) L-RGB CCD FILTER SET (1.25”)
Designed for CCD astrophotography, the set includes Luminance-IR, Red, Green, and Blue dichroic CCD filters. The filters are resistant to humidity and scratching and set into a durable aluminium alloy threaded mounting ring. The red green and blue filters have been developed to closely match the natural colours of stars, planets and emission nebulae, whilst the luminance filter removes damaging haze and ultraviolet. The filters offer light transmission of nearly 100%. Please note the red, green and blue filters are not IR coated.
OVL CODE 20207

Price: 149.00



DEEP SKY FILTER (1.25") DEEP SKY FILTER (1.25")
This filter blocks low and high pressure mercury and sodium vapour lamplight and neon light whilst letting the rest of the visible spectrum through. Excellent for viewing all deep sky objects under the urban sky. Suitable for visual observations and for CCD photography.
OVL CODE 20211

Price: 39.99



CLEAR SKY FILTER (1.25") CLEAR SKY FILTER (1.25")
This filter blocks night glow and airglow, sodium and mercury emissions (but not UV or IV). This versatile broadband filter is suitable for all objects, whether you are viewing them with your eyes, or capturing them with your camera. Suitable for visual observations and for CCD photography.
OVL Code 20209

Price: 39.99



colour filter set of 3 Astro 1.25" fitting colour filter set of 3 Astro 1.25" fitting
This set of 3 colour filters are for standard 1.25" Astronomical Eyepieces and are normally £12.50 each RRP
We are selling this set of 3 for just £18.00
Set contains
Wrattan #21 Orange
A Wratten #21 will be found to be one of the most useful filters to have. It is used to bring out details on Mars and enhance some of the zonal details on Jupiter. An orange filter darkens the blue sky so daytime observations of Jupiter, Venus and the Moon are much improved.
Wrattan # 11 Yellow/Green
Yellow-Green helps to bring out dark surface detail on Jupiter and Saturn, darkens the maria on Mars, and improves visual detail when viewing Neptune and Uranus through large telescopes.
Wrattan #12 Yellow
Yellow filters help greatly in viewing Mars by bringing out the polar ice caps, enhancing blue clouds in the atmosphere, increasing contrast, and brightening desert regions. Yellow also enhances red and orange features on Jupiter and Saturn and darkens the blue festoons near Jupiter's equator.
Postage to UK Free

Price: 18.00



H-Beta Filters 1.25" and 2" H-Beta Filters 1.25" and 2"
This high performance CCD filter transmits only the Hydogen Beta emission line, and therefore is useful for greatly increasing the contrast of objects that glow in the corresponding region of the spectrum, for example the Horsehead, Cocoon and California nebulae.
Available in 1.25" and 2" sizes.
Recommended for capuring H-beta emitting objects using CCD photography under dark skies See Graph


1.25" Fitting 20204 £29.99

2" Fitting 20205 £39.99



Skylight Filter SCT Rear cell fitting Skylight Filter SCT Rear cell fitting
This general purpose Wratten #1A filter improves color saturation and balance, increases visual and photographic contrast, and decreases glare in lunar and planetary observing.

The filter threads on to the rear cell of Celestron or Meade Schmidt-Cassegrain telescope to serve as an effective dust seal. By leaving this filter on when attaching or removing other visual accessories, to prevent dust and other atmospheric contaminants from entering the rear of Schmidt-Cassegrain telescope.
SALE PRICE! NORMAL RRP £49.99 WHILE STOCKS LAST
SORRY SOLD OUT

Price: 39.00


SET OF 3 COLOUR FILTERS- QUALITY GSO BRAND 2" FITTING SET OF 3 COLOUR FILTERS- QUALITY GSO BRAND 2" FITTING
Set of 3 filters 2" fitting

Screws on the back of standard 2" eyepieces to enhance planetary detail.

ORANGE #21

YELLOW #12

BLUE #80A

COMPLETE WITH FOAM LINED STORAGE BOXES
RRP £36.00 - SAVE £14.00 See uses for each Filter here

Price: 22.00



5-POSITION FILTER WHEEL  FOR IMAGING OR VISUAL OBSERVING 5-POSITION FILTER WHEEL FOR IMAGING OR VISUAL OBSERVING
This handy, time-saving device is a must-have for astronomers, for both visual and photographic use.
Up to five filters can be installed in the threaded, numbered compartments, and each can be selected for your eyepiece or camera by simply rotating the inner wheel to any of the five click-stop positions. One compartment can be left empty for unfiltered viewing.
The filter wheel can be attached to your focuser either by the supplied 1.25” nosepiece adaptor or via a T-thread.
The robustly constructed filter wheel is supplied with a 1.25” eyepiece adaptor, 1.25” focuser nosepiece, T-2 camera adaptor and locking ring.
Please note: your focuser will require 20mm of inward focusing distance from the normal focus position to compensate for the thickness of the filter wheel.
OVL 20206

Price: 79.00



7 Piece Filter Set. 1.25" fitting 7 Piece Filter Set. 1.25" fitting
A Seven piece Filter Set comprising
Wratten numbers 12,21,23a,56,82a,Moon filter and polorising filter
Special offer price while stocks last.
Normal price £59.99


Price: 44.99



1.25" Lunar/Planetary Filter Set  1.25" Lunar/Planetary Filter Set
Comprises 4 x high quality glass colour filters. Yellow, Red, Green & Moon/Neutral Density Filters included. These filters will fit most internally-threaded eyepiece barrels of 1.25"/31.7mm format. Supplied in attractive foam-lined plastic screw top storage case
OVL 20202

Price: 29.99



O-III Narrowband Filters 1.25” and 2”    O-III Narrowband Filters 1.25” and 2”
The O-III narrowband filter is specially designed for the observation of gas and planetary nebulae.

It distinguishes different contrasts of the wavelengths of light that pass through, giving ideal conditions for the observation of faint super nova remnants and planetary remnants.

The O-III narrow band-pass filter isolates just the two doubly ionized oxygen lines (496 and 501nm) emitted by diffuse, planetary and extremely faint nebulae. O-III filters work ideally with larger aperture telescopes in the 200mm and larger range. With larger aperture telescopes, observers will have a better opportunity to identify nebulae objects in the deep sky. It can produce near-photographic views of the Veil, Ring, Dumbbell, Orion, plus many other nebulae under dark skies. These Available in two sizes, threaded to fit either standard 1.25” or 2” astronomical eyepieces. Supplied with storage case.




1.25" fit 20194 £42.99

2" fit 20196 £69.99



UHC (Ultra High Contrast) Filters 1.25” and 2”  (OVL) UHC (Ultra High Contrast) Filters 1.25” and 2” (OVL)
The UHC filter is the best all-around dark-sky nebula filter. Thenarrowband UHC filter, like the O-III filter, isolates the two doubly ionized oxygen lines (496 and 501nm) in addition to the hydrogen-beta line (486nm) emitted by planetary and most emission nebulae. This filter permits superb views of objects like the Orion, Lagoon, Swan and other extended nebulae. It performs well in smaller aperture instruments owing to its greater light transmission than the O-III, yet still suppresses light pollution well. Available in two sizes, threaded to fit either standard 1.25” or 2” astronomical eyepieces. Supplied with storage case.
Choose size from below


SEE WAVE GRAPH


1.25" 20195 £42.99

2" 20197 £69.99



Light Pollution Filters 1.25” and 2”  Light Pollution Filters 1.25” and 2”
These contrast-enhancing anodized aluminium, optical glass filters are designed to block out the wavelengths of light emitted by mercury-vapour light and other common causes of light pollution, whilst providing higher transmission at critical hydrogen-alpha and hydrogen-beta lines than competing filters. Bright, light-polluted skies appear much darker, and the contrast between object and sky is improved significantly. This contrast-enhancement effect is particularly apparent on nebulae. Unlike stars, emission nebulae give off light in a very narrow range of wavelengths. These filters allow maximum transmission of the important wavelengths of H-alpha, H-beta and doubly ionized oxygen – the ones most commonly emitted by nebulae. Views of galaxies and star clusters are also enhanced, but to a lesser degree. Also improves contrast on reddish planetary detail. Works well in telescopes of all apertures but is highly recommended for use on smaller telescopes up to 114mm diameter, where conventional filters swallow up too much light. Available in two sizes, threaded to fit either standard 1.25” or 2” astronomical eyepieces. Supplied with storage case.

Choose from below




1.25" fit 20198 £19.99

2" fit 20199 £29.99



Variable Polarising Filters 1.25” and 2”  Variable Polarising Filters 1.25” and 2”
These high quality anodized aluminium, optical glass variable polarising filters reduce the amount of light entering your eyepiece. You can progressively dim the view when observing a bright object, such as the Moon or certain planets, to a level according to your needs, whilst increasing contrast, reducing glare and increasing the amount of detail that can be studied. The light transmission can be varied from 40% down to as little as 1%. The filter will not change the colour of the object being viewed and will prevent eye fatigue and loss of night vision. Each filter set consists of two polarizing filters, one which can be rotated in its cell to adjust the brightness. The filters, used as single elements, can also be used for daytime terrestrial use for reducing sunlight glare from lakes oceans or window glass. Available in two sizes, threaded to fit either standard 1.25” or 2” astronomical eyepieces. Supplied with storage case.

Choose from below


1.25" fit 20200 £29.99

2" fit 20201 £39.99



Moon Filter Standard 1.25" fitting Moon Filter Standard 1.25" fitting
Use this quality moon filter to enhance
your viewing of the moon.
Complete with storage box

Price: 12.00



Skywatcher Budget Moon Filter Skywatcher Budget Moon Filter
Low cost Moon Filter Ideal for starter scopes
OVL 20405

Price: 9.99



 Baader UHC-S / L-BOOSTER FILTER 31.7MM Baader UHC-S / L-BOOSTER FILTER 31.7MM
Premium deep sky nebula filter from Baader Planetarium.
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Price: 57.00


Baader UHC-S / L-BOOSTER FILTER 2INCH Baader UHC-S / L-BOOSTER FILTER 2INCH
Premium deep sky nebula filter from Baader Planetarium. Optically polished.
SORRY UNNAVAILABLE More...

Price: 97.00


Baader Fringe Killer Filter 31.7mm Baader Fringe Killer Filter 31.7mm
The BAADER Fringe-Killer Filter minimizes unwanted blue fringing, comparable to a Minus-Violet-Filter, while retaining a very pleasing color balance. This would be a contradiction in itself ? only made possible by applying modern DWDM plasma assisted coating technology, allowing almost a hundred coating layers to be accumulated onto a planoptically polished substrate ? without destroying the optical figure! This fineoptical tool will help a small refractor to really put the advertized magnification within reach. Performance rivals that of the most expensive color correcting lens systems, costing 20 times as much!
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Price: 52.00


Colour Filter Set 10 - 31.7mm Colour Filter Set 10 - 31.7mm
Kit includes: 21, 80A, #15, Polarizing filters

Celestron color filters are mounted in black anodized aluminum cells with the Kodak Wratten Series Number individually engraved, and come available in 4 assorted kits packed in plastic cases. The cells of each filter are double-threaded, so they can be stacked (piggybacked) 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.

Eyepiece filters are an invaluable aid in lunar and planetary observing. They reduce glare and light scattering, increase contrast through selective filtration, increase definition and resolution, reduce irradiation and lessen eye fatigue. Celestron's filters are made of high quality, solid plane parallel glass with excellent homogeneity. They're anti-reflection coated to prevent glaring and ghosting. All eyepiece filters are threaded to fit Celestron's, and most other manufacturer's, 1?" eyepieces, and offer a full 26mm clear aperture.

Price: 41.00



Colour Filter Set 20 - 31.7mm Colour Filter Set 20 - 31.7mm
Kit includes: #12, #25, #56, ND-25 filters


Price: 41.00



Colour Filter Set 30 - 31.7mm Colour Filter Set 30 - 31.7mm
Kit includes: #23A, #38A, #58, ND-50 filters


Price: 41.00



Colour Filter Set 40 - 31.7mm Colour Filter Set 40 - 31.7mm
Kit includes: #8, #47, #82A, ND-13 filters

Price: 41.00



93608 Polarizing Filterset 31.7mm 93608 Polarizing Filterset 31.7mm
This set of two polarizer filters reduces reflected polarized light in the Earth's atmosphere.

Also helpful for splitting binary stars by reducing glare and diffraction around the brighter star of the binary pair. On moon and planets it is invaluable for reducing irradiation and glare.

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.


Ambient daylight is normally comprised of multiple wavelengths of light, vibrating in multiple planes. The Eyepiece Polarizing Filter Set transmits only light moving along a specific plane, thereby increasing the contrast between surfaces with different planar transmissions. Generally, the polarization effect makes blue skies a deeper blue, eliminates surface reflections and helps reduce atmospheric haze.

The Polarizing Filter Set is intended for visual use. It`s particularly useful for reducing glare while observing the moon, double stars, the planets and terrestrial subjects ? all without affecting the color of the object being observed.

The Filter Set is comprised of two filters that thread into either the eyepiece or the filter adapter, which comes with the set. When one filter is used alone, you get 30% light transmission. When both filters are used together, you can vary the degree of transmission. By causing the amount of transmitted light to vary, the filters become, in effect, a continuously variable neutral density filter. At maximum density, the Polarizing Filter Set transmits only 5% of entering light.

Price: 33.00



2 inch filter set of 7  2" fitting 2 inch filter set of 7 2" fitting
2" FILTER SET
Comprises 7 x threaded filters in total. Wratten numbers Yellow #12, Orange#21, Light Red#23a, Light Green#56, Light Blue#82a, Polarising Filter, Moon/Skyglow Filter. These filters will screw-in to most eyepiece barrels of 2"/50.8mm Format.
OVL 20994


Price: 79.99



A range of coloured filters. 31.7mm fitting. A range of coloured filters. 31.7mm fitting.
Eyepiece filters are an invaluable aid in lunar and planetary observing. They reduce glare and light scattering, increase contrast through selective filtration, increase definition and resolution, reduce irradiation and lessen eye fatigue.
Our 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 most manufacturers 1.25" eyepieces and offer a full 26mm clear aperture. Choose from the following.

SPECIAL OFFER! BUY 4 OR MORE AND WE WILL KNOCK 20% OFF!!(Price will be adjusted when we process your order and will not show at checkout)
Read here about the different filters and their uses


#15 dark yellow 67% 12.50

# 12 Deep yellow 74% 12.50

# 8 Light yellow 83% 12.50 SORRY OUT OF STOCK

#80A medium blue 30% 12.50 SORRY OUT OF STOCK

# 82A Light blue 73% 12.50

#38A Dark blue 17% 12.50

#56 Light green 53% 12.50

#58 Dark green/Moon 24% 12.50 SORRY OUT OF STOCK

#47..... Violet 3% 12.50

Neutral density 50% 0.3 12.50

Neutral density 25% 0.6 12.50 SORRY OUT OF STOCK

Neutral density 13% 0.9 12.50 SORRY OUT OF STOCK

# 21 Orange 46% 12.50

# standard Moon filter 15.00

# 25 Mid Red 14% 12.50

#11, yellow/green 78% £12.50



Baader UV/IR Blocking Filter Baader UV/IR Blocking Filter
The only infrared blocker in this price range featuring a planeoptically polished substrate, parallel to within 30 seconds of arc! In combination with the unique properties of the BAADER Contrast-Booster the resulting spectral window eliminates all known effects of image deterioration – an absolute MUST for digital imaging.




31.7mm fitting 48.00

50.8mm fitting 80.00



Baader Neodymium Filter with UVblocker coating. Baader Neodymium Filter with UVblocker coating.
Drastically improves contrast for all reflector telescopes, without loss of brightness!
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31.7mm fitting 62.00

50.8mm fitting 78.00


Baader OIII Filter 31.7mm Baader OIII Filter 31.7mm
The Baader OIII filter offers high contrast views of diffuse and planetary nebula, especially under extremely light polluted skies. The Baader OIII filter is one of the narrowest transmission band OIII filters on the market making it particularly well suited to CCD imaging thanks to its unsurpassed contrast.
SORRY UNNAVAILABLE

Price: 75.00


Baader Contrast Booster 31.7mm Filter Baader Contrast Booster 31.7mm Filter
A unique filter for many different astronomical tasks. Incomparable in accracy to combinations of generic color filters made of raw polished glass – where surface inaccuracy adds up in the optical wave front to an unbearable degree! Especially designed to improve the ubiquitous beginners telescopes – to provide a professional replacement for the simple `dark green` Moon & Solar-Filters made of `raw polished` glass.
SORRY UNNAVAILABLE



Price: 53.00


Online Catalogue  | Astronomical Accessories | Astro Eyepiece filters.


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