Telescope-Service Eyepiece Filters

Telescope-Service - Your Expert for Telescopes, Mounts, Binoculars, Spotting Scopes and Accessories. We offer a broad selection of eyepieces, filters, accessories for astro-imaging and many more interesting items.

Astronomical Filters

Filters are used in almost all fields of amateur astronomy. The uses are manifold.

On the sun or the moon the primary purpose is to reduce the image brightness, on gas nebulae the purpose is to raise contrast by blocking unwanted light pollution.

Easy Payment: We offer our customers several easy and fast payment methods. You will receive exact payment details when ordering or on request!


TS Colour Filters 1.25" and 2" excellent colour filters - better contrast on the moon and the planets	TS Vartiable Colour And Polarizing Filter ultra-versatile filter for suppression of false colour, reduction of glare and boosting contrast	TS Neutral Filters 1.25" & 2" and Variable Polarizers reduce the image brightness on the moon and the planets to see fine details	Universal Contrast Filter UCF a contrast boosting filter for planets, moon and deep sky. Both for visual and photo use

IR & UV Cut Filters for photographical applications. Also needed for some methods of solar observing or as dust protection	Skylight Filter for SCTs light pollution suppression filter and dust protection for Schmidt-Cassegrain telescopes	TS Optics UHC Filter contrast boosting filter for deep sky observing. Available in 1.25" and 2"	TS Optics O-III Filter Narrowband nebular filter for observing and imaging. Available in 1.25" and 2"

Astronomik Nebular Filters different broadband and narrowband nebular filters for visual use and CCD imaging - 1.25" and 2"	Canon EOS Insert Filters dust-protection and astronomical filters to insert directly into the body of your Canon EOS	ATiK Filter Wheel for 5pcs 1.25" filters with T2 connectors Manual or motorized.

BAADER Filters (separate page)	Orion (USA) Filters (separate page)	Baader Solar Filters (separate page)

excellent quality filters Contrast Filter, CCD, False Colour reduction filters for achromatic refractors, ...	Broadband and Narrowband Filters 1.25", 2" and SC Variable Polarizers 1.25" and 2"	Varioius filters for solar observing: White light, contrast filters, K-line, H-Alpha

1.25" & 2" TS-Optics Colour Filters

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A short comparison between simple but expensive filters and the TS Filters

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Other Filters

Thick ring

Often made of plastic

With eyepieces of 25mm focal length or longer there is a certain amount of vignetting

No filter combinationis possible because filters cannot be screwed into each other

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TS - Filters
Thin metal body with filter threads on both sides.

No vignetting

Combinations of filters are possible

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2" Filters
Like the 1.25" the TS 2" filters have a well-made thin metal body. The advantages are the same

TS Colour Filters
Our TS colour filters offer an excellent value for your money. Naturally they come in beautiful boxes where you can store them safely.

You can use the filters both visually and photographically without reservations.

TS Quality:
- the filter housing is made of metal and as thin as possible to avoid vignetting.
- the glass used in our filters is very homogenous and parallel
- we promise a very good image quality!
- filter threads on both sides allow you to combine different filters. For example, a blue filter and a yellow filter combined resemble a green filter.

Art. No.	Recommended min. Aperture	Recommended for use on...	Price - Euro incl. VAT 1.25"	Price - Euro incl. VAT 2"
Light Yellow	from 50mm	Moon, Mars, comets - you can reduce false colour in Fraunhofer refractors. A nice universal contrast filter, even for small aperture telescopes.	13.90	-
Yellow / Green	from 60mm	Well suited for observations of Jupiter and Saturn. Reveals atmospheric structures even in small aperture telescopes.	13.90	28.-
Yellow	from 80mm	Enhances contrast on the moon, reveals surface details and clouds on Mars, enhances cloud structures on Jupiter (e.g. the Great Red Spot). Can be used in double star observations with refractors - reduces false colour in Fraunhofer refractors.	13.90	28.-
Dark Yellow	from 120mm	Similar to yellow, suitable for bigger aperture telescopes. Removes false colour in Fraunhofer refractors.	13.90	28.-
Orange	from 80mm	Enhances contrast in daytime and twilight observations (Venus, Mercury) by suppressing the blue light. Reveals details on Mars (in larger aperture telescopes). Further details in Jupiter's and Saturn's atmosphere are revealed. You may try spotting atmospheric structures on Uranus with large aperture telescopes.	13.90	28.-
Light Red	from 60mm	For very high contrast on the Moon - suitable for small aperture telescopes. This filter is used when observing the polar ice caps on Mars (100mm aperture and larger). Well suited for Venus by blocking the blue daylight. The sky appears black.	13.90	-
Red	from 80mm	Similar to light red, suitable for telescopes of 100mm aperture and larger.	13.90	28.-
Dark Red	from 120mm	Similar to light red, suitable for telescopes of 150mm aperture and larger. This filter will make for an extreme contrast.	13.90	-
Light Blue	from 50mm	An important universal contrast filter for all telescopes, similar to light yellow. It brings along a gain in contrast on many objects within our solar system.	13.90	28.-
Blue	from 70mm	General contrast gain on the moon, off its terminator. Enhances contrast in Jupiter's and Saturn's cloud bands. Enhances surface details on Mars. In large aperture telescopes you may see cloud details on Venus. Good comet filter - boosts contrast in the comet's tail.	13.90	-
Dark Blue	from 100mm	Similar to blue, suited for telescopes of 150mm aperture or larger.	13.90	-
Violet	from 120mm	Well-suited for observing Venus in telescopes of 150mm aperture or larger. It makes visible the dark clouds in Venus' atmosphere. Boosts structures in Saturn's rings. You may also use this filter on Mercury under good seeing conditions in large telescopes.	13.90	-
Green	from 60mm	An important universal contrast filter. Drastically boosts contrast on the Moon - better contrast even far off the terminator - suitable for low magnifications. This filter is especially effective on Jupiter, revealing the famous Great Red Spot and other reddish details in the Jovian atmosphere. White spots in Saturn's atmosphere are enhanced in telescopes of 200mm aperture or larger.	13.90	28.-
Dark Green	from 100mm	Similar to green, but suitable for telescopes of 150mm aperture or larger.	13.90	-

In order to save on shipping charges we recommend our filter sets: Three, four or six filters of your choice.

Art.No.	Short description	Price -Euro incl. VAT
TSFI Set3	Set of three 1.25" TS colour filters of your choice	39.-
TSFI Set4	Set of four 1.25" TS colour filters of your choice	50.-
TSFI Set6	Set of six 1.25" TS colour filters of your choice	69.-
	Set of two 2" TS colour filters of your choice	50.-

Protective Cases For Filters

Please send requests or online orders to: sales@telescope-service.com

Variable Colour and Polarizing Filter - TS CC

Top image: variable colour function of the TS CC1 filter.
Lower image: variable polarizer function.

Only one TS CC filter was used for all of the above images. This shows its remarkable versatility.

The available colours and shades of grey are freely adjustable.

We are proud to introduce a sensational new product: The TS Variable Colour and Polarizing Filter. The filter replaces more than eight other filters in function. You will need less filters, and consequently have less filters to carry around or buy in the first place. The filter can be adjusted freely so you get a very broad variety of uses.

1) Variable Polarizing Filter For Reduction of Glare and Image Brightness
used for observing the moon and planets. Transmission approximately between 15 and 80%.

2) Variable Colour Filter For Suppression of False Colour in Refractors
- All refractor telescopes have to a varying degree a certain colored fringe around bright objects. This fringe generally has a yellowish or violet coloration. The TS CC can be adjusted to match the telescope, eyepiece, object and observing conditions to suppress this false color. At the same time the coloration of the image remains as minimal as possible.

3) Variable Colour Filter for Boosting Contrast on the Planets
The TS CC filter is particularly suited for boosting contrast on Jupiter and Saturn, both of which being planets with a generally yellowish surface color, as well as Mars and Venus which react favorably to a blue/purple setting of the filter.

4) Usable in Nearly All Telescopes
- the filter is simply screwed into the 1.25" filter thread of your eyepiece or camera adaptor. It can be adjusted to optimally match each telescope.

Item No. Short description Price - Euros incl. VAT

TS CC 1 TS Variable Colour and Polarizing Filter - with plastic case for safe storage.
Including English manual. 44.-

Please send requests or online orders to: sales@telescope-service.com

Neutral Filters (1.25" and 2") and Variable Polarizing Filters

Neutral density filters:
TS ND-0.9 TS ND-0.6 TS ND-0.3

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FXP - variable polarizing filter

Polarizing Filters and Neutral Filters for 1.25" Eyepieces

With these filters you can reduce the brightness of an object - usually the moon or a planet - in order to enhance the ability to see fine details. The filters are screwed into the eyepiece's filter thread. There is no distracting colour like in cheaper green moon filters.

You can combine the neutral filters and the polarizers with TS colour filters (see description above). With their thin metal bodies there will be no vignetting - even with long focal length 1.25" eyepieces.

Recommended Use:
On bright objects like the Moon or the planets (but also during terrestrial observations) you will find that it is necessary to reduce the brightness in order to see further details. In large telescopes observing comfort will rise drastically - you will not feel blinded.

Transmission means how much of an object's light passes the filter. 25% means that one quarter of the light will pass the filter, three quarters are blocked.

Item No.	Trans mission	Short description	Price - Euro incl. VAT
TSND03	50%	Neutral filter for small telescopes up to 80mm aperture	17.-
TSND06	25%	Neutral filter for telescopes from 90mm to 115mm aperture	17.-
TSND09	13%	Neutral filter for telescopes from 120mm to 200mm aperture	17.-
ANND13	8%	Neutral filter for telescopes with an aperture of 200mm or larger	17.-
FXP 1	1%-40%	Variable polarizer consisting of two polarizing filters in a special body - you can easily adjust the transmission according to your needs	47.-

Protective Cases For Filters

2" Neutral Filters

These filters are like the 1.25" neutral filters, but suitable for 2" eyepieces or 2"-1.25" adaptors with 2" filter thread - that way you can change the eyepieces quickly without having to change the filter.

The filters have a filter thread at both sides - you can combine them with colour filters

Item No.	Trans mission	Short description	Price - Euro incl. VAT
AN ND 25 2z	25%	Medium neutral filter - recommended for the moon and the planets, but also for splitting double stars.	35.-
AN ND 13 2z	13%	Strong neutral filter - recommended for the moon or the sun (only in combination with a Herschel Prism or another dedicated solar filter!	35.-

Protective Cases For Filters

Please send requests or online orders to: sales@telescope-service.com

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TS UCF 1 - universal contrast boosting filter
A contrast boosting filter for moon, planets and nebulae - for photography and observing

TS UCF 1 universal contrast filter for multiple applications - for 1.25" eyepieces

Good quality filters can mean the difference between seeing or not seeing. The TS UCF 1 is an all purpose contrast boosting filter, equally suitable for beginners and advanced amateurs. It can be used on all telescope sizes and types.

Some Examples of Use:
-- Jupiter and Saturn ... strong gain in contrast on reddish details, like the Great Red Spot on Jupiter, or any other red details on a planet. Compared with a normal colour filter the image will not be tainted as much, resulting in a more "natural" image.
-- Mars ... Mars is notoriously a planet with weak contrasts. The contrast is boosted with the TS UCF filter, working out previously invisible detail, in particular on the polar caps.
-- Twilight Observing ... contrast is improved, the blue glare on the sky is reduced for a darker background.
-- Daytime Observing ... another application in which contrast is boosted without causing an unnatural coloration of the object.
-- Gas Nebulae ... similar in function to a classic nebular filter the UCF 1 boosts contrast, in particular in the red H-Alpha emission line. The background is reduced in brightness, working out details also in other wavelengths. The UCF 1 filter is less extreme than more narrow-band filters - highly recommended for small telescopes where conventional filters swallow too much light. (Up to approximately 114mm aperture, but the filter of course also works with bigger telescopes.)

Filter Effect
The following two images show the effect of the TS UCF 1 contrast filter, shown here with moon as an example:


Moon with the UCF 1 Filter	Moon without the UCF 1 Filter

Prices:

Item No.	Short Description	Price - Euros incl. VAT
TS UCF 1	UCF filter 1.25" with plastic storage box for protection, with beautiful gift box.	24.90

Please send requests or online orders to: sales@telescope-service.com

TS IR & UV Cut Filters - 1.25" & 2"
high quality filter for imaging. Can also be used for dust protection

TS IR & UV Cut filter 2".
When viewed from above the filter is colour neutral. The filter does not change the white balance of the camera.

IR & UV Cut Filter for Imaging
Many cameras are sensitive in the UV and IR part of the spectrum. At the same time many telescopes and accessories such as Barlow lenses and focal reducers are not well corrected in these parts of the spectrum.

The result is that an image will not be perfectly sharp and contrast will be lost.

The solution for this is an IR & UV cut filter. The filter improves contrast and image sharpness.

Recommended for:
- Philips Webcam (colour and monochrome version)
- Imaging Source DMK and DBK cameras
- ATiK CCD cameras
- most other CCD cameras

Dust Protection
The IR & UV cut filter is almost perfectly colour neutral and has close to 100% transmission in the visible spectrum. This makes the filter ideally suited for dust protection of your CCD camera.

Prices:

Item No.	Short Description	Price - Euros incl. VAT
TS IR 1	TS IR & UV Cut Filter 1.25"	29.99
TS IR 2	TS IR & UV Cut Filter 2"	55.-

Please send requests or online orders to: sales@telescope-service.com

TS Skylight Filter for Schmidt-Cassegrain Telescopes

The TS Skylight filter is an important accessory for Schmidt-Cassegrain telescopes. It serves two purposes:

Firstly, the Skylight filter reduces the negative effects light pollution caused by urbanization. This effect is intentionally small - only the main sources of stray light are filtered out, the majority of the light passes the filter. As a result of this you can leave the filter permanently installed, even when viewing galaxies or star clusters where stronger filters cannot be used.

Most imortantly: The Skylight filter is the ideal dust protection for your Schmidt-Cassegrain telescope! It closes off the rear of the tube, keeping dust out permanently. The filter itself is largely scratch-resistant and therefore easy to clean if the need arises.

Prices:

Item No.	Short Description	Price - Euros incl. VAT
TS Skylight	Skylight filter - SCT thread female on SCT thread male	49.-

Please send requests or online orders to: sales@telescope-service.com

TS UHC Filters - 1.25" & 2"
high quality Ultra-High Contrast (UHC) nebular filter for improved contrast

TS Optics UHC Filter 1.25"

Strongly Improved Contrast with the TS Optics UHC Filter
An ocean of city lights causes a large amount of background illumination that drastically reduces the visibility of space objects. This is the case everywhere but in the most remote rural areas. As a result of this you can see much less of an objects and much fewer objects than would be possible with your telescope.

With the TS Optics UHC Filter this light pollution is almost completely blocked, strongly improving contrast for astronomical observations!

Under typical observing conditions only a couple of dozen objects are easily visible, even in large telescopes. Even in very rural areas in Europe there is still a certain amount of light pollution, reducing visibility of fine details.

The TS Optics UHC Filter moves hundreds of additional objects within reach of your telescope! At the same time is strongly improves visibility of details.

How the TS Optics UHC Filter Works
The light pollution caused by city lights is present nearly constantly throughout the entire visible spectrum. By contrast, many bright space objects emit light only in a few specific wavelengths. The most important of these wavelengths for visual observing are O-III and H-Beta.

Many objects emit light almost exclusively in these wavelengths.

This is where the TS Optics UHC Filter comes in: It permits precisely these important wavelengths and at the same time blocks the other wavelengths nearly completely. This reduces the background light to a fraction of its original intensity, while the light from the object can pass almost unhindered.

The transmission curve to the left shows how this works. The green bars resemble the H-Beta and O-III emission lines. The red curve resembles the transmission of the TS Optics UHC Filter, demonstrating its narrow bandpass.

Example: Dumbell Nebula M27
The TS Optics UHC Filter can be used to maximum effect on Gas Nebulae and Planetary Nebulae. Gas nebulae are huge congregations of hydrogen gas, million times heavier than our own sun! Planetary nebulae like the Dumbell Nebula are the remnants of old stars at the end of their lives.

In the above image we have simulated the effect of the TS Optics UHC with the Dumbell Nebula M27. The left image shows how the Dumbell Nebula appears in a typical telescope as seen from a small town. The right image shows the same object under the same conditions but with the use of the TS Optics UHC Filter. You can clearly discern many additional details as compared with the impression without the filter!
(Unfortunately it is not possible to show the visual effect on a real photo since cameras perceive celestial objects differently. For this reason we have simulated the effect by digital image processing. The image was made to resemble the true impression as closely as possible and to the best of our knowledge.)

Specifications:
- Filter for the suppression of light pollution. Filter curve as shown above.
- Filter Size: 1.25"
- 1.25" standard filter thread
- precisely machined metal cell!
- storage box for dust protection included

We recommend to use the TS Optics UHC Filter on all telescopes with approximately 120mm aperture or larger. The filter can of course also be used on smaller aperture telescopes, but it reduces the image brightness quite a bit.

Prices:

Item No.	Short Description	Price - Euros incl. VAT
TS UHC 1	TS Optics UHC Filter 1.25" with storage box for dust protection	69.-
TS UHC 2	TS Optics UHC Filter 2" with storage box for dust protection	109.-

Please send requests or online orders to: sales@telescope-service.com

TS O-III Filters - 1.25" & 2"
high quality Oxygen-III nebular filter for improved contrast

TS Optics O-III Filter 1.25"

Strongly Improved Contrast with the TS Optics O-III Filter
An ocean of city lights causes a large amount of background illumination that drastically reduces the visibility of space objects. This is the case everywhere but in the most remote rural areas. As a result of this you can see much less of an objects and much fewer objects than would be possible with your telescope.

With the TS Optics O-III Filter this light pollution is almost completely blocked, strongly improving contrast for astronomical observations!

Under typical observing conditions only a couple of dozen objects are easily visible, even in large telescopes. Even in very rural areas in Europe there is still a certain amount of light pollution, reducing visibility of fine details.

The TS Optics O-III Filter moves hundreds of additional objects within reach of your telescope! At the same time is strongly improves visibility of details.

How the TS Optics O-III Filter Works
The light pollution caused by city lights is present nearly constantly throughout the entire visible spectrum. By contrast, many bright space objects emit light only in a few specific wavelengths. The most important of these wavelengths for visual observing is the Oxygen line O-III.

Many objects emit the majority of light in this wavelength.

This is where the TS Optics O-III Filter comes in: It permits precisely this important wavelength and at the same time blocks the other wavelengths nearly completely. This reduces the background light to a fraction of its original intensity, while the light from the object can pass almost unhindered.

The transmission curve to the left shows how this works. The green bar resembles the O-III emission line. The red curve resembles the transmission of the TS Optics O-III Filter, demonstrating its narrow bandpass.

Example: Dubell Nebula M27
The TS Optics O-III Filter can be used to maximum effect on Gas Nebulae and Planetary Nebulae. Gas nebulae are huge congregations of hydrogen gas, million times heavier than our own sun! Planetary nebulae like the Dumbell Nebula are the remnants of old stars at the end of their lives.

In the above image we have simulated the effect of the TS Optics O-III with the Dumbell Nebula M27. The left image shows how the Dumbell Nebula appears in a typical telescope as seen from a small town. The right image shows the same object under the same conditions but with the use of the TS Optics O-III Filter. You can clearly discern many additional details as compared with the impression without the filter!
(Unfortunately it is not possible to show the visual effect on a real photo since cameras perceive celestial objects differently. For this reason we have simulated the effect by digital image processing. The image was made to resemble the true impression as closely as possible and to the best of our knowledge.)

Specifications:
- Filter for the suppression of light pollution. Filter curve as shown above.
- Filter Size: 1.25"
- 1.25" standard filter thread
- precisely machined metal cell!
- storage box for dust protection included

We recommend to use the TS Optics O-III Filter on all telescopes with approximately 150mm to 200mm aperture or larger. The filter can of course also be used on smaller aperture telescopes, but it reduces the image brightness quite a bit.

Prices:

Item No.	Short Description	Price - Euros incl. VAT
TS O3 1	TS Optics O-III Filter 1.25" with storage box for dust protection	74.-
TS O3 2	TS Optics O-III Filter 2" with storage box for dust protection	109.-

Please send requests or online orders to: sales@telescope-service.com

New Telescope-Service Online Shop:

Astronomik Filters

Filters are the salt for astronomical observing and imaging. A selection of good quality filters can improve observing quality and fun greatly!

- precisely polished parallel surfaces
- perfect light transmission tailored to the needs of the visual or photographic astronomer
- dielectric coating - even after several years the filters will still be like new
- the filters do not age
- the filters are fully water-resistant, perfectly suited for outdoor use (which is where you will use them, after all)
- all filters come in nice and safe transport boxes

Visual Filters
UHC	UHC-E	O-III	CLS	H-Beta
Medium nebular filter. Suitable for telescopes with 100mm aperture and larger	Light nebular filter. Suitable for telescopes up to 100mm aperture	Strong nebular filter. Suitable for telescopes with 150mm aperture and larger	Light nebular filter. Suitable for telescopes up to 100mm aperture	Strong nebular filter. Suitable for telescopes with 250mm aperture and larger
Photographical Filters
H-Alpha	IR Cut Filter	L-Filter (UV & IR Cut)	LRGB	CLS
Medium and strong filters for DSLR and CCD cameras	Blocks IR, permits UV. For many photographical applications	Blocks IR and UV. For many photographical applications	Colour filters and filter kits for CCD photography	Light filter for DSLR cameras

EOS Insert Filters
Filters that are directly inserted into the front of the body of a Canon EOS camera - no additional filter adaptation is necessary.
At the same time the filter protects the camera's sensor from dust!

Canon EOS Insert Filters / Clip Filters

Dust protection and astrophotographical filters for Canon EOS cameras.

You have a Canon EOS digital SLR camera (300D, 350D, 400D, 20D .... et al.) and also use it for astro-imaging?

Then you probably know the usual problems:
-- good quality screw-in type filters are quite expensive
-- often there is no sufficient back-focus to install filters at all, e.g. when using an Off Axis Guider.
-- it is difficult to keep the proper distance between a coma corrector and the camera's sensor when using a conventional filter adaptation.

This problem concerns everybody, not only amateur astronomers:
-- when changing the lens or during astro-imaging the camera's sensor is unprotected! Dust can settle on the sensor and is then difficult and dangerous to remove.

The EOS Insert Filters are the Ideal Solution !!!

Further Information in our new Online Shop

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