Baader Planetarium H-Beta 2 CCD narrow band filter 8.5 nm ( 2458426) all astro filters opinie

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The Baader Planetarium H-Beta CCD 2 "filter is a filter designed for visual observation and photography, especially with large aperture instruments, hydrogen nebulae. The filter passes the practically intact H-β line, blocking the remaining wavelengths The increase in contrast is so great that it is even possible to see the Koñski £ eb nebula with a 10-12 inch telescope.

The filter should not be used in observations with telescopes with a diameter of less than 20 cm, because they do not collect enough light for the signal to be strong enough for the observer's eye.

Usage

• visual observations under dark skies: very good despite the limited objects
• visual observations under city skies: not applicable
• photography on film: sometimes appropriate, sometimes not; very long exposure times required
• CCD photography: very good
• unmodified SLR photography: very good
• SLR photography modified for astrophotography: very good

Technical specifications

• type: ± narrowband, H-beta, λ = 486 nm
• binding: 2 "
• FWHM / half width: 8.5 nm
• transmission Tmax = approx. 75%
• substrate: glass
• thickness: 2 mm
• layers: MC
• weight: 70 g

guarantee

24 months