Specifications

The h-beta filter astounding high light transmission brings better views of deep-sky-objects, BV assessed 24years factory

H-beta

 

The 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 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.

Main use

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 filters when extremely fast aperture ratios of 1:3 and higher are used. The 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.

Suitability

• Visual observation (dark skies): Verry good, but only suitable for a few objects
• Visual observation (urban skies): Unsuitable
• Film photography: It depends, very long exposure time
• DSLR photography (original): Verry good, but only suitable for a few objects
• DSLR photography (astro modified): Verry 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

Technical Data

• 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!

The filter is available in the following sizes