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Baader O III nebular filter - 1.25" - 10 nm HBW

Item condition: used Item with possible small cosmetic deffect, but every function works perfect

58.82 €
Delivery date : 2-3 days
Skywatcher 9x50 Finderscope with holder- straight

Item condition: used Item with possible small cosmetic deffect, but every function works perfect

46.22 €
Delivery date : 2-3 days
Baader - Solar Continuum contrast filter for solarobserving 2" The Baader Solar Continuum Filter lets pass a small part of the solar spectrum around 540 nm. In this wavelength the flares, granules and other structures have the highest contrast. The image of the sun appears in deep green - with extreme contrast. The effect of the Baader Solar Continuum filter: - The contrast of the solar surface is highly increased. Especially structures like flares on the solar limb, granulation and fine structures at the rim of sun spots become more clearly visible. - The chromatic abberation of achromatic and ED objectives is completely blinded out. - The Baader Solar Continuum is not a simple green filter, it is a specialist for the sun. It has its maximum transmission exactly there where the solar structures offer their maximum contrast. - The narrow band filter reduces the seeing´s influence on the image quality. Fine details become more steady. Delivery contains: Filter Box Specifications: Filter effect: Contrast filter for solar observing Barrel size / Filter thread: 2" with filterthread Diameter: for 48 mm Weight: 1.6 oz

Item condition: used Item with possible small cosmetic deffect, but every function works perfect

Wichtiger Hinweis zur Mehrwertsteuer:
Dieses Angebot unterliegt mit Ausnahme der Versandkosten gemäß § 25a UStG der Differenzbesteuerung, weshalb auf den angebotenen Artikel keine Umsatzsteuer erhoben und ausgewiesen wird.
140.00 €
Delivery date : 2-3 days
Baader IR Pass Filter 2" - for planetary photography With the help of these filters, some of the world´s best Mars photographs using webcams were taken. The trick: In addition to the color image you make an exposure for the "LUMINANCE channel", but not - as usual - with the spectral bandwidth of 400 to 700 nm, but shifted deep into the red - starting at 670 nm. The transmission window starts at deep red 670 nm, i.e. just in the visible range, so that you can focus properly. The effect: In the long wavelength spectral range, atmospheric air turbulence (the "seeing") has a much smaller effect on the sharpness of the image! Dark structures on Mars, Jupiter, but also for example on the Moon and the Sun are rendered much sharper and can be integrated as fourth image information into the colored (RGB) image. For every owner of a CCD camera a highly interesting extension of the "arsenal" against air turbulence. The IR-pass filter in deep-sky use This is also possible, many hobby astronomers also experiment with deep-sky photography to make the interesting information visible in the near IR range. Especially stars in nebulae can be emphasized, because in this region there are hardly any emission lines and the dust blocks less light. Note: The human eye is hardly sensitive in this range, so this filter is intended for photographic applications only.

Item condition: used Item with possible small cosmetic deffect, but every function works perfect

Wichtiger Hinweis zur Mehrwertsteuer:
Dieses Angebot unterliegt mit Ausnahme der Versandkosten gemäß § 25a UStG der Differenzbesteuerung, weshalb auf den angebotenen Artikel keine Umsatzsteuer erhoben und ausgewiesen wird.
87.50 €
Delivery date : 2-3 days
A filter set especially designed for astrophotography with CCD cameras. These filters provide a natural color reproduction of planets, stars, emission and reflection nebulae. The transmission properties of the L-RGB Typ 2c filters are optimized for CCD astrophotography. The set allows to take images in correct colour for all types of objects. Where other brands make strange compromises, Astronomik does the best colour reproduction possible. Both, stars as well as objects that emit only in spectral lines, are reproduced in their true colors. You get CCD images with perfect colors, as if the objects where bright enough to be seen with photopic vision. This feature is the main difference between Astronomik LRGB filters an those of other manufacturers. The following aspects have been most important for the design of Astronomik LRGB filters: ♦ simple image processing for the user ♦ highest transmission (nearly 100%) for short exposure times ♦ adjusted transmissions of the individual filters for optimal colour reproduction ♦ integrated IR blocking up to approx. 1150 nm ♦ the use of industry standards Astronomik doesn´t stop thinking at the step of taking the picture. More important a tool should be given to the astrophotographers that offers a simple and elegant editing process. To maintain the colour, they calculated their filterset for the sRGB color space, that is used as an industry standard from most manufacturers of monitors, printers and imaging software. As a user you do not need to spend time to learn about colourimetry and colour spaces. Astronomik have solved the special problems of astrophotography for you. Due to the high-precision machining of the carrier substrate, Astronomik filters are parfocal with wedge errors below all usual margins. In order not to be the bottleneck in a high-quality optical system, Astronomik filters are of course diffraction limited. Issues concerning focal distances as well as the exact location of the images of each colour image are not a problem at all! Main use: The L-RGB filter set divides the spectrum into its components red, green, blue and luminance. Thus colour separation can be achieved with pure b/w CCD sensors. The separation corresponds to the colour sensitivity of the human eye according to DIN 5032. By using the sRGB color space, it is possible to maintain the color of the image throughout the entire image processing and output. With an Astronomik L-RGB filter set and your camera, you create ideal raw material for imageprocessing in the sRGB color space. Other uses: ♦ In combination with the Astronomik line filters, your images will show interesting details of astronomical objects. For example, the red image can be enhanced by H-alpha or the green image by [O III]. ♦ For planetary observation and photography, the color filters are gladly "misused". Suitability: ♦ Visual observation (dark skies): Good, used as colour filter for planetary observations ♦ Visual observation (urban skies): Good, used as colour filter for planetary observations ♦ Film photography: Unsuitable ♦ CCD photography: Very good, excellent colour separation with RGB and L-RGB pics ♦ DSLR photography (original): Unsuitable ♦ DSLR photography (astro modified): Unsuitable ♦ DSLR photography (MC modified): Unsuitable ♦ Webcam / Video (Planets): Good, used as colour filter for imaging planets ♦ Webcam / Video (Deep Sky): Good, used as colour filter for imaging planets Technical Data: ♦ Parfocal with other Astronomik filters ♦ Glass thickness: 1 mm ♦ Completely resistant against high humidity, scratches and aging effects ♦ Diffraction limited, the filter will not reduce the optical performance of your telescope! ♦ Astronomik filters are delivered in a high-quality, long lasting, filter box

Item condition: used Item with possible small cosmetic deffect, but every function works perfect

Wichtiger Hinweis zur Mehrwertsteuer:
Dieses Angebot unterliegt mit Ausnahme der Versandkosten gemäß § 25a UStG der Differenzbesteuerung, weshalb auf den angebotenen Artikel keine Umsatzsteuer erhoben und ausgewiesen wird.
404.25 €
Delivery date : 2-3 days
Astronomik OIII 12nm - CCD Filter, 1.25 inch mounted The OIII-CCD Filter is suitable for imaging of OIII nebulas from observation sites with light pollution and from dark sites as well. The contrast between an object glowing at 501nm and the background is increased enormous! Due to the combination of the narrow bandwidth of 6nm and the high transmission of typically 96% the filter gives you an enormous contrast boost, as all unwanted light from other wavelengths than scattered is blocked form UV up to the IR. This results in an extremly dark background. The FWHM of 6nm is matched to give you optimal performance with CCD and CMOS sensors with a very low dark current! The 6nm filter is the best choice if you are observing from a heavily light polluted site or if you are imaging faint objects in starcrowded regions of the milkyway. Due to the new MFR coating technique you may use one single filter on all instruments up to f/4 without a significant reduction in performance. Der Astronomik H-alpha filter MUST NOT BE USED for solar observation! Imaging with Narrowband-Emissionline Filters If you have to observe from light polluted sites (like most of us...), imaging with Narrowband-Emissionline filters is the best way to take great images, as all kind of light pollution can be blocked very effective! Normaly an H-alpha filter should be your first step into this amazing field of astrophotography! With an Narrowband H-alpha filter you will be able to take deep and contrasty images even wih very heavy light pollution or with the full moon high up in the sky! If you look at other astrophotos, an H-alpha is the best choice for all nebulas glowing red! An OIII filters expands your imaging possibilities, as you are able to image all greenish/blueish structures. Planetary nebulas and star forming regions are great targets! The SII filters completes your HSO-set of filters. With these three filters you are able to process your images like the ones from the Hubble space telescope! The h-beta filter is not available in a 6nm version, as this filter has nearly no meaningfull application. To illustrate this, there are two images shown below: Both were taken with a unmodified Canon 650D. Even as the camera has a sensitivity of less than 10% at H-alpha, there is some signal und structure in the h-alpha image, while you cannot see anything on the image taken with an H-beta filter! Operation of the filter: The filter blocks all unwanted light from artifical light-pollution, natural airglow and moonlight. Especially light from High- and Low-Pressure Sodium and mercury lights and all lines of natural airglow are 100% blocked. The filter increases the contrast between the sky-background and objects glowing at the OIII line at 501nm. Tipps and Hints for more applications: Using the OIII-CCD filter together with H-alpha-CCD and SII-CCD filters you make produce false-color emission line images (HSO) in the same way as the Hubble-Space telescope. This is possible even from heavyly light polluted sites! Specifications: Full-Width-Half Maximum (FWHM): 12nm perfect blocking of unwanted light: from UV up to the IR parfokal with all Astronomik filters: Yes Coating technique: MFR Usable with all optics up to: up to f/4 Thickness: 1mm Filter thread / size: 2" Guaranteed Transmission at the OIII Line (501 nm): >90% Typical Transmission at the OIII Line (501 nm): 96%

Item condition: used Item with possible small cosmetic deffect, but every function works perfect

Wichtiger Hinweis zur Mehrwertsteuer:
Dieses Angebot unterliegt mit Ausnahme der Versandkosten gemäß § 25a UStG der Differenzbesteuerung, weshalb auf den angebotenen Artikel keine Umsatzsteuer erhoben und ausgewiesen wird.
224.25 €
Delivery date : 2-3 days
{Stacked Solar Continuum Filter - for even more contrast at the sun}]The stacked Solar Continuum Filter consists of two 1.25" filters that are slightly tilted to each other. The filters are placed in a special holder. The filter substrate thickness is 2 mm each. The following description is for the simple Solar Continuum filter. It applies equally to the stacked filter, although the stacked Solar Continuum brings even more contrast, the sun also appears slightly darker. The Baader Solar Continuum filter transmits only a very narrow band of sunlight around 540 nm. The spectral range is very precisely delimited. In this narrow band region, flares, granulation and structures in the sunspots have the highest contrast. The image of the Sun appears deep green and with strong contrast. Caution: For visual use, you will need an objective solar filter, such as the Baader Filter Foil for Visual Use. Never visually observe the sun with only the Solar Continuum Filter! This is what the Baader Solar Continuum Filter does ♦ The contrast of the solar surface increases significantly. Especially structures like the flare areas at the sun´s edge, the granulation and also fine structures at the edge of sunspots become more prominent. ♦ The chromatic aberration of Fraunhofer achromats as well as the residual chromatic aberration of ED lenses is completely faded out. The image is sharp and clear. ♦ The Baader Solar Continuum Filter is not a simple green filter, it is a specialist for solar observation. The passband is designed to maximize contrast. ♦ The narrow-band passband reduces the influence of seeing. This allows finer details to be seen. The Transmission Curve Due to the narrow bandpass, even with fast Fraunhofer refractors (e.g., with f/5) a successful solar observation is possible!

Item condition: used Item with possible small cosmetic deffect, but every function works perfect

Wichtiger Hinweis zur Mehrwertsteuer:
Dieses Angebot unterliegt mit Ausnahme der Versandkosten gemäß § 25a UStG der Differenzbesteuerung, weshalb auf den angebotenen Artikel keine Umsatzsteuer erhoben und ausgewiesen wird.
136.00 €
Delivery date : 2-3 days
The Astronomik H-alpha filter is a narrow band filter for CCD photography. The filter lets the H-alpha light of emission nebulae pass and blocks nearly the whole remainder of the spectrum where the CCD is sensitive. The full width at half-maximum (FWHM) of 12 nm is optimized for the use with common CCD cameras and allows the use of very fast optics. It should be noted that the filter has a transmission of up to 99%. Another advantage of the 12 nm filters is the availability of guiding stars for cameras with a built-in-autoguider (SBIG). If you use a very strong filter like our 6 nm filter, you often won’t find a usable guidestar. An example for an exposure made at the rim a city can be found in "Reviews". The range of application extends from 1:2.8 to 1:15. Transmission losses and chromatic distortions, which arise with other filters, only occur with Astronomik filters when extremely bright aperture ratios of 1:2 and more come into play. Main use: The Astronomik H-alpha CCD filter (12 nm version) increases the contrast between objects, in this case H-alpha emitting nebulae, and the skyglow background. This filter completely suppresses the emission lines of artificial lighting (mercury (Hg) and sodium (Na)) and skyglow. Other uses: ♦ With using the [O III]-CCD and the [S II]-CCD filters, you can obtain three-color images of emission line objects (gas nebulae) from locations with very strong light pollution. To do so, you would take an image in three different wavelengths, select each one as a color-channel in Photoshop and paste them together as a color image. ♦ Achromatic refractors still have chromatic aberrations which make the star images bigger. With lines filters like this one, star images will shrink. ♦ The Astronomik 12 nm H-alpha filter may NOT be used for solar observation. ♦ If you plan to create color images from emission line data, our CLS-CCD filter is a great choice for the Luminance channel. Suitability: ♦ Visual observation (dark skies): Unsuitable ♦ Visual observation (urban skies): Unsuitable ♦ Film photography: Reasonable, but very long exposure times ♦ CCD photography: Very good, huge contrast enhancement at H II-emission nebulae ♦ DSLR photography (original): Good, reduced sensitivity in the H-alpha band ♦ DSLR photography (astro modified): Very good, huge contrast enhancement at H II-emission nebulae ♦ DSLR photography (MC modified): Very good, huge contrast enhancement at H II-emission nebulae ♦ Webcam / Video (Planets): Unsuitable ♦ Webcam / Video (Deep Sky): Good, good contrast enhancement with bright objects Technical Data: ♦ Transmission of over 97% with the H-alpha line (656 nm) ♦ Complete blocking from all disturbing wavelengths up to infrared ♦ Parfocal with other Astronomik filters ♦ Glass thickness: 1 mm ♦ Completely resistant against high humidity, scratches and aging effects ♦ Diffraction limited, the filter will not reduce the optical performance of your telescope! ♦ Astronomik filters are delivered in a high-quality, long lasting, filter box.

Item condition: used Item with possible small cosmetic deffect, but every function works perfect

Wichtiger Hinweis zur Mehrwertsteuer:
Dieses Angebot unterliegt mit Ausnahme der Versandkosten gemäß § 25a UStG der Differenzbesteuerung, weshalb auf den angebotenen Artikel keine Umsatzsteuer erhoben und ausgewiesen wird.
224.25 €
Delivery date : 2-3 days
Ertl Elektronics EQDIR USB Adapter for almost all Skywatcher GoTo mounts With this electronics adapter "made in Germany", you can control your Skywatcher mount directly via PC with a planetarium program (like Cartes du Ciel), without using the hand controller. Comes with USB cable for plugging in, thus the connection cable can be exchanged effortlessly.

Item condition: used Item with possible small cosmetic deffect, but every function works perfect

Wichtiger Hinweis zur Mehrwertsteuer:
Dieses Angebot unterliegt mit Ausnahme der Versandkosten gemäß § 25a UStG der Differenzbesteuerung, weshalb auf den angebotenen Artikel keine Umsatzsteuer erhoben und ausgewiesen wird.
45.50 €
Delivery date : 2-3 days
In a clear night, most surfaces radiate much heat and cool down. As soon as the temperature falls below the dew point, dew forms and the observations are over. A dew heater replaces the radiated heat without causing turbulence and thus bad seeing, therefore keeps the temperature above the dew point and prevents dew formation. The economically priced AST Optics are made with quality materials and finishing. An important advantage is the low power consumption. Due to the RCA plug and 12 V power supply, the heaters are compatible with most popular controllers like Astrozap, Kendrick and Rigel

Item condition: used Item with possible small cosmetic deffect, but every function works perfect

Wichtiger Hinweis zur Mehrwertsteuer:
Dieses Angebot unterliegt mit Ausnahme der Versandkosten gemäß § 25a UStG der Differenzbesteuerung, weshalb auf den angebotenen Artikel keine Umsatzsteuer erhoben und ausgewiesen wird.
29.38 €
Delivery date : 2-3 days
Vixen 2x APO Barlow DX - 1,25" An apochromatic barlow lens for high sharpness and contrast. When the barlow lens is inserted directly in front of the eyepiece, you get 2x magnification. However, you can also use the barlow lens in front of a 1.25" star diagonal, in which case the magnification increases to about 4x. We recommend the APO Barlow lens from Vixen especially for Newtonian telescopes and for well-corrected refractors such as the EDs from Vixen.

Item condition: used Item with possible small cosmetic deffect, but every function works perfect

Wichtiger Hinweis zur Mehrwertsteuer:
Dieses Angebot unterliegt mit Ausnahme der Versandkosten gemäß § 25a UStG der Differenzbesteuerung, weshalb auf den angebotenen Artikel keine Umsatzsteuer erhoben und ausgewiesen wird.
83.30 €
Delivery date : 2-3 days
New materials and improved design ensure greater precision and resilience with the Wide Photo Adapter Increased material strength for additional stability 6 screws hold the camera in position Screw tips with Delrin inserts prevent the camera from tilting Large interior diameter prevents shadowing 2 screw sets prevent scratches on the camera housing Black interior prevents scattered light Compatible with 60 mm accessories

Item condition: used Item with possible small cosmetic deffect, but every function works perfect

Wichtiger Hinweis zur Mehrwertsteuer:
Dieses Angebot unterliegt mit Ausnahme der Versandkosten gemäß § 25a UStG der Differenzbesteuerung, weshalb auf den angebotenen Artikel keine Umsatzsteuer erhoben und ausgewiesen wird.
104.30 €
Delivery date : 2-3 days