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Have a question? We'd love to help. Email: info@all-startelescope.com Call Us: (587) 336-6621 Toll Free: 1 (866) 310-8844

Antlia 3nm Narrowband H-Alpha (Ha) Pro 36mm Unmounted (H-ALPHA-3NM-PRO-36MM)

by Antlia
SKU ANT-H-ALPHA-3NM-PRO-36MM
Original price $422.95 - Original price $422.95
Original price
$422.95
$422.95 - $422.95
Current price $422.95

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Antlia H-alpha Pro narrowband filter optimizes the FWHM (full width half maximum) to 3nm bandpass. As the bandwidth becomes narrower, the 3nm Pro narrowband filters enhance contrast of emission targets by lowering the unwanted background signal. Antlia H-alpha 3nm Pro filters are designed to deliver 88% transmission at the 656.3nm line which provides you with the maximum signal and well defined nebulae structures.

Description

Conventional broader narrowband filters cause a heavy loss in transmission due to the strong Center Wavelength (CWL)-shift. We guarantee T>88% within 1nm range of the center bandwidth, which means that the 3nm Pro narrowband filter can guarantee high transmittance for working with both long focal ratios and fast optical systems. Blue-shift data shows that Antlia 3nm Pro filters can be used with nearly all systems as fast as f/3 with minimal loss in emission signal and meets the requirements of fast optics like Hyperstar and RASA.

The out of band blocking specification is rated OD5 (0.001%) which delivers an excellent SNR(signal to noise ratio) and effective cut-off rate to minimize interference from other wavelengths. Improved sharp cut-off astrophotography 3nm Pro filters are designed to minimize halos around bright stars.

Application and Performance

  • High transmittance and smallest bandwidth to maximize contrast
  • Steep spectral profile minimizes halos around bright stars
  • A single substrate to eliminate internal reflections
  • Narrowband Objects: H-alpha Emission Nebulae, Planetary, Wolf Rayet Nebulae and Supernova Remnants
  • Use in light polluted areas and dark sites
  • Extends imaging time when the moon is up
  • Antlia narrowband Pro filters can be used down to F/3 systems with slight loss of signal
  • All Antlia Narrowband filters are edge blackened to eliminate internal reflections from stray light
  • Superior optical reliability reduces post image processing
  • This filter is not suited to deep sky objects that do not contain H-alpha emissions.

Specifications

  • Basic Substrate: Schott optical substrate
  • Filter Thickness: 2mm+/-0.05mm for Dia33mm
  • FWHM (Full width at half maximum): 3nm
  • CWL (Central Wavelength): 656.3nmnm
  • Peak Transmission: >88%
  • Blocking: > 5 OD(0.001% out of band blocking) @ 300-1000nm
  • Surface Quality: S/D (scratch/dig)= 60/40 (Refer to MIL-O-13830)
  • Transmitted Wavefront: Lambda/4 or better.
  • Parallelism: less than 30 arcsec
  • Single / Non-glued substrate
  • Warranty: 3-years against delamination

Customer Reviews

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D
Dave M.
Just recently bought the

Just recently bought the 7-piece set of LRGB + Ha, Oiii and Sii filters and have had an opportunity to test only the three 3nm narrowband filters. I like them--a lot. I have used the much more expensive Astrodon filters on another setup and would say without having done a careful side-by-side comparison that the Antlia filters I have used so far have performed very well, and deliver great value for the money.