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Alpine Astronomical Baader 3.5nm Ultra-Narrowband H-alpha CCD Imaging Filter (1.25" Eyepiece Mount)

Alpine Astronomical Baader 3.5nm Ultra-Narrowband H-alpha CCD Imaging Filter (1.25" Eyepiece Mount)

B&H # ALFHALNU1 MFR # FHALNU-1
Alpine Astronomical Baader 3.5nm Ultra-Narrowband H-alpha CCD Imaging Filter (1.25" Eyepiece Mount)

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Expected availability: 2-4 weeks

Product Highlights

  • For Deep-Sky Astrophotography/Imaging
  • 656.3nm Centered Wavelength
  • For f/10 to f/3.5 Optical Systems
  • NOT Safe for Solar Viewing
  • Improves Contrast of Dim Objects
  • Eliminates Light Pollution and Moonlight
  • Dielectrically Anti-Reflection Coated
  • Planeoptically Precision Polished
  • Standard 1.25" Eyepiece Filter Frame
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Wavelength: H-alpha

H-alpha Oxygen-III

Not available with current selections

Sulfur-II

Not available with current selections

Size & Mounting: 1.25" Eyepiece Filter Mount

1.25" Eyepiece Filter Mount 2" Eyepiece Filter Mount

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31mm Round, Unmounted

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36mm Round, Unmounted

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50.4mm Round, Unmounted

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50x50mm Square, Unmounted

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65x65mm Square, Unmounted

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Bandpass: 3.5nm

3.5nm 35nm

Special Order

4.5nm

Not available with current selections

7nm

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8.5nm

Special Order

8nm

Not available with current selections

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$297.00
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Alpine Astronomical FHALNU-1 Overview

  • 1Description

Centered on the 656.3nm wavelength and passing an extremely narrow bandwidth, the 1.25" eyepiece filter-frame mounted Alpine Astronomical 3.5nm Ultra-Narrowband H-alpha CCD Imaging Filter is ideally suited for use with full-frame CCD and CMOS imaging sensors on optical systems, including telescopes and astrographs of all configurations and apertures, ranging from a super-fast f/3.5 to a more moderate f/10.

Planeoptically polished and dielectric anti-reflection coated, this filter uniformly passes the maximum amount of the bandwidth possible to virtually eliminate halos, reflections, and ghosting to reveal details of wispy nebulae and dim stars that filters with wider bandpasses cannot resolve. It also completely rejects light pollution and blocks longer interfering wavelengths, enabling even the faintest deep-sky objects to be imaged regardless of where you are located or whether the moon phase is normally unfavorable. This version of the Ultra-Narrowband H-alpha filter is offered here mounted in a conventional filter frame to fit standard 1.25" eyepieces and accessories for projection and afocal imaging techniques.

This filter is intended only for deep-sky astroimaging with CCD systems, and should never be used for direct solar viewing or solar photography as permanent injury to your eye and equipment can occur, up to and including blindness.

In the Box
Alpine Astronomical Baader 3.5nm Ultra-Narrowband H-alpha CCD Imaging Filter (1.25" Eyepiece Mount)
  • Baader Stackable Filter Box
  • Limited 2-Year Warranty
  • Table of Contents
    • 1Description

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