Astronomik H-beta 1,25 filter (8H0057) all astro filters opinie

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Astronomik H-β filter in 1.25" / 31.7 mm mount

The Astronomik H-beta filter is designed for visual observations of hydrogen nebulae, particularly with large-aperture instruments. The filter allows the H-beta line to pass through virtually unaffected while blocking other wavelengths. The contrast increase is so dramatic that even the Horsehead Nebula can be seen with a 10- to 12-inch telescope.

It is not worth using the filter in telescopes with a diameter less than 20 cm, because they do not collect enough light to make the signal strong enough for the observer's eye.

There are not that many objects in the sky for which it is worth using an H-beta filter, but its use often determines the possibility of seeing an object or not.

Applications

• visual observations under dark skies: very good despite limited facilities
• visual observations under urban skies: not applicable
• film photography: sometimes appropriate, sometimes not; very long exposure times required
• CCD photography: good when used with an additional IR filter
• unmodified SLR photography: very good
• photography with a SLR modified for astrophotography: very good
• webcam/video camera for planetary photography: not applicable
• webcam / video camera for photography of nebular objects: not applicable

Technical parameters

• transmits almost 100% of the H-beta line
• completely cuts out unnecessary wavelengths
• diffraction accuracy ( diffraction-limited )
• parfocal with other Astronomik filters
• thickness: 1 mm
• resistant to moisture, scratching, does not age