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Astronomik H-beta CCD Filter

Astronomik H-beta CCD Filter
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Our Price:  £100.00(Inc. 20% VAT)
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Filter Size:  


Model:  AF230
Brand:  Astronomik

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In stock, immediate despatch



The half width of 12nm is optimized for the use of 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%, which cannot be attained by stacking more narrow-band filters. A further note, which led to selecting the half width (FWHM), is the dark current of common CCD imagers. Exposures with a CCD cooled to -15°C are limited by the dark current of the CCD, even in large cities with a bright background.

Another advantage of the 12nm filters is the better availability of guiding stars for cameras with a built-in-autoguider (SBIG). If you use a very strong filter like our H-alpha 6nm filter you often won't find a usable guidestar.

Together with the other three Astronomik emission-line filters you can do great color images even from very light polluted places!

The filter has a built-in IR-blocker up to 1150nm. You don't need an additional IR-blocker with this filter.
Main use
The Astronomik H-beta-CCD increases the contrast between objects, in this case between the H-beta emission line and the skyglow background. Our Astronomik H-beta-CCD completely suppresses the emission lines of artificial lighting (mercury (Hg) and sodium (Na)) and skyglow. The optimal aperture ratio for this filter is 1:3.5 to 1:6. 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.
Other uses
When using the Astronomik H-beta CCD filter together with the H-alpha CCD, OIII-CCD and the SII-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.
When using the Astronomik H-beta filter together with the H-alpha-CCD you can create charts of the ionization energy in nebulas by creating an image from the ratio of H-alpha vs. H-beta.
If you plan to create color images from emission line data, our CLS-CCD filter is a great choice for the Luminance channel
The H-beta-CCD is also great for visual observation. If you plan to get filters for visual observation and for astrophotography get the CCD filter: You may use this filter visual as well as in front of you camera. The built-in IR-blocker doesn't disturb visual observation but you need an additional IR-blocker if you want to use the visual filer with your camera.

Suitability
  • Visual observation (dark skies): Verry good, but only suitable for a few objects
  • Visual observation (urban skies): Unsuitable
  • Film photography: It depends, very long exposure time
  • CCD photography: Verry good, but only suitable for a few objects
  • DSLR photography (original): Verry good, but only suitable for a few objects
  • DSLR photography (astro modified): Verry good, but only suitable for a few objects
  • DSLR photography (MC modified): Verry good, but only suitable for a few objects
  • Webcam / Video (Planets): Unsuitable
  • Webcam / Video (Deep Sky): Unsuitable
Technical Data
  • 98% transmission at 486nm (H-beta)
  • full width at half maximum 12nm
  • complete blocking from 350nm to 470nm and 500nm to 1100nm
  • Parfocal with other Astronomik filters
  • Glass thickness: 1mm
  • 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
The filter is available in the following sizes
  • Mounted filter in 1,25" cell (M28,5mm x 0,5mm)
  • Mounted filter in 2" cell (M48,5mm x 0,75mm)

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