Astronomik HBeta-CCD Filter, 12nm, Anschluss Clip-EOS XL
279.00 €
The Astronomik H-beta filter is a narrow band emission-line filter
for CCD photography. The filter lets the H-beta 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 12nm 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 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): Very good, but only suitable for a few objects
- Visual observation (urban skies): Unsuitable
- Film photography: It depends, very long exposure time
- CCD photography: Very good, but only suitable for a few objects
- DSLR photography (original): Very good, but only suitable for a few objects
- DSLR photography (astro modified): Very good, but only suitable for a few objects
- DSLR photography (MC modified): Very good, but only suitable for a few objects
- Webcam / Video (Planets): Unsuitable
- Webcam / Video (Deep Sky): Unsuitable
Astronomik HBeta-CCD Filter, 12nm, Anschluss Clip-EOS XL
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