Astronomik H Alpha 6nm CCD Filter
H-alpha is not only a popular wavelength for sun observers, but also for the observation of deep-sky-objects, for which this filter has been designed, and is on no account to be used for solar observing.
The H-alpha filter offered here serves mainly the needs of the Deep Sky CCD photographer. The H-alpha filter transmits the wavelength range of hydrogen nebulas and blocks nearly the whole remaining rest of the spectrum to which CCDs are sensitive.
The human eye already shows a very small sensitivity for H-alpha at daylight. At night this sensitivity is completely missing. To enhance visual observation the filters can be attached in front of modern night-vision devices.
The 6nm h-alpha filterwill give an improved performance over Astronomik's well-known h-alpha-filter with a full width at half maximum (FWHM) of 13nm offers a new FWHM of 6nm with more than 85% transmission.
By the extremely small FWHM you achieve good results even under extreme light polluted skies. Under good skies, the filter can be used to lower the number and brightness of the stars in the photograph field and so to increase the contrast of hydrogen fog objects significantly.
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 6nm-CCD filters preserve the pinpoint stars to which you are accustomed from your instruments.
Features
- High transmission of nearly 100% at H Alpha 6nm
- FWHM of ca. 6nm
- 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 6nm 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 H Alpha 6nm CCD Filter 1¼" | £159.00 |
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| Astronomik H Alpha 6nm CCD Filter 48mm | £363.00 |
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| Astronomik H Alpha 6nm CCD Filter EOS Clip | £253.00 |
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