New Category (71302)

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

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Dieses Angebot unterliegt mit Ausnahme der Versandkosten gemäß § 25a UStG der Differenzbesteuerung, weshalb auf den angebotenen Artikel keine Umsatzsteuer erhoben und ausgewiesen wird.

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.

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.

Item condition: new, but not original packed

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.

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.

Baader T-2 standard quick-change system (T-2 components #06 + #07) with nebular filter, special design for Binos

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.