Astronomik H Alpha CCD Filter
The Astronomik H Alpha-CCD filter, is designed for CCD imaging of gas and planetary nebulae.
Due to the narrow bandpass of the H Alpha line at 656 nm, the filter provides maximal increase in contrast even under poor observing conditions.
The 13 nm bandwidth allows us to achieve transmission as high as 97% -a value that is impossible to reach with filters of narrower bandwidth.
With faint supernova remnants and planetary nebulae, the Astronomik H Alpha-CCD filter often makes the difference between detecting the object or not. The filter blocks all unwanted light, especially the Mercury (Hg) and Sodium (Na) emissions from streetlights and the IR region where CCDs are often most sensitive.
The optimal focal ratio for the use of this filter is between 1:3.5 and 1:6. The range of application is from 1:2.8 up to 1:15. Unlike other filters of narrower bandpass, loss of transmission with the Astronomik filters does not emerge until focal ratios of 1:2 or faster are used. You can, therefore, image objects within the whole field of view and not only in the middle. This also makes it possible to use the guiding chip of SBIG cameras that otherwise receive almost no light with filters from other companies.
Togther with Astronomik's OIII-CCD filter and SII-CCD filter you can now do
tricolor-imaging of emission line objects even from very heavy light polluted places.
Due to the well known high optical quality of the glass substrate, Astronomik H Alpha-CCD filters preserve the pinpoint stars to which you are accustomed from your instruments.
Features
- High transmission of nearly 100% at H Alpha
- FWHM of ca. 13nm
- total blocking of all unwanted light from light-pollution
- the ideal planetary nebulas and supernova remnants
- completly resistant against high humidity and scratches
- highest optical quality on the market
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NB The Astronomik H Alpha is NOT suitable for Solar Observing!
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| Available from Venturescope as 1¼", 2" and Canon EOS Clip-Filter | ||
| FREE post and packing to UK Mainland | ||
| Astronomik 12nm H Alpha CCD Filter 1¼" | £104.00 |
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| Astronomik 12nm H Alpha CCD Filter 48mm; | £235.00 |
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| Astronomik 12nm H Alpha CCD Filter EOS Clip | £152.00 |
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