Astronomik H-beta Filter
Click the image for full resolutionThe Astronomik H-beta is a filter for visual observation, in particular with instruments of larger aperture.
It lets the light of the H-beta emission line pass nearly unhindered and blocks the remaining spectral range to the extent that the eye is dark adapted. By the use of the Astronomik H-beta filter, the contrast is increased so strongly, that even the observation of the Horse Head Nebulae with telescopes of 10" - 12" reaches the realm of the possible.
The optimal aperture ratio for the use of the filter is 1:4,5 to 1:6. The range of application extends from 1:3.5 to 1:15. Transmission losses and chromatic distortions, which arise with other filters, are only apparent with the Astronomik filters when extremely fast aperture ratios of 1:3 and higher are used. The Astronomik H-beta filter will allow you to view large objects, in the whole field of view of the eyepiece, even when using wide-angle eyepieces - not only in the center of the eyepiece. This filter should be used on telescopes with a diameter of 8 " (20cm) or larger. Smaller instruments do not gather enough light for meaningful and satisfying astronomical work. Due to the high optical quality of the Astronomik H-beta filter substrate you will see the same needle-sharp stars as you would from your regular telescope.
- In the whole sky, there are few objects that benefit from the use of this filter in visual observation. On the other hand h-beta filters often decide about seeing or not seeing an object. Without a filter the eye is hardly able to discover the low contrasts of H-alpha regions.
- With EOS Clip Filter even in extreme light polluted areas photography with DSLR cameras becomes possible.
- 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: Good, when used with an additional IR-block-filter
- 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): Good, when used with an additional IR-block-filter
- Webcam / Video (Planets): Unsuitable
- Webcam / Video (Deep Sky): Unsuitable
- Transmission of nearly 100% of the H-beta line
- complete blocking of all disturbing wavelengths
- Main operational use: Hydrogen Nebulae
- No moisture (humidity) sensitivity, no aging, and totally scratch-proof
- Excellent carrier material - substrate is optically polished. The optical performance (resolution & contrast) of your telescope is not reduced in any way by the filter.
- 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
Clip-Filter (EOS) with ASTRONOMIK Hßexcl. VAT (Non-EU): €133.61 incl. VAT (EU): €159.00Excl. shipping
ASTRONOMIK H-beta; T-thread cell (M42x0,75)excl. VAT (Non-EU): €142.02 incl. VAT (EU): €169.00Excl. shipping
ASTRONOMIK H-beta; SC-cell (2" / 24TPI)excl. VAT (Non-EU): €167.23 incl. VAT (EU): €199.00Excl. shipping
ASTRONOMIK H-beta; 1,25" (M28,5)excl. VAT (Non-EU): €83.19 incl. VAT (EU): €99.00Excl. shipping
ASTRONOMIK H-beta; 2" (M48)excl. VAT (Non-EU): €167.23 incl. VAT (EU): €199.00Excl. shipping
ASTRONOMIK H-beta; Ø31mm, unmountedexcl. VAT (Non-EU): €83.19 incl. VAT (EU): €99.00Excl. shipping
ASTRONOMIK H-beta; Ø36mm, unmountedexcl. VAT (Non-EU): €108.40 incl. VAT (EU): €129.00Excl. shipping
ASTRONOMIK H-beta; Ø50mm, unmountedexcl. VAT (Non-EU): €167.23 incl. VAT (EU): €199.00Excl. shipping
Filter-Messprotokollexcl. VAT (Non-EU): €10.00 incl. VAT (EU): €11.90Excl. shipping