The H-Beta filter is a narrowband filter specially designed for visual observation like Horsehead Nebula California and Cocoon Nebulae in Dark Skies.
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SV132 2" H-Beta 25nm Visual Nebulosity Filter

In Stock Unavailable
SKU: W9102B

Regular price US$ 59.99

The H-Beta filter is a narrowband filter specially designed for visual observation like Horsehead Nebula California and Cocoon Nebulae in Dark Skies.

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Model

SV132

Type

H-Beta

Size

2-Inch

Substrate

B270

Substrate Thickness

1.85mm

Wavelength Range

400-700nm

CWL

486nm±2nm

FWHM

25nm±2nm

T peak

90%

Blocking

OD3 @300-1100nm

Clear Aperture

44mm

Surface Quality

60/40

Surface parallelism

1/4λ

Parallelism

30"

Net Weight

13.2g / 0.47oz

The H-Beta filter is a narrowband filter specially designed for visual observation. It is mainly aimed at the 486nm (blue) line spectrum nebula, removes the interference of other light, and improves the contrast. During observation, in order to see sufficient dark nebula, it is necessary to ensure a large enough luminous flux with a large-aperture telescope. Small-aperture telescopes are not recommended. It is suitable for observing the Horsehead Nebula in Orion and the California Nebula. Filter with metal 2" threads fits 2" eyepieces and diagonal barrels.

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