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Antlia H-alpha Pro narrowband filter optimizes the FWHM (full width half maximum) to 3nmbandpass.As the bandwidth becomes narrower, the 3nm Pro narrowband filters enhance contrast of emission targets by lowering the unwanted background signal. AntliaH-alpha3nm Pro filtersaredesigned to deliver 88% transmission at the 656.3nm line which provides you with the maximum signal and well defined nebulae structures.
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 signaland meets the requirements of fast optics like Hyperstar and RASA.
The out of band blocking specification is rated OD5(0.001%) which delivers an excellentSNR(signal to noise ratio)and effective cut-off rate to minimize interference from other wavelengths.Improvedsharp cut-off astrophotography 3nm Pro filters are designed to minimize halos around bright stars.
Application and Performance:
High transmittance and smallest bandwidthto maximizecontrast
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 anddark sites
Extendsimaging time when the moon is up
Antlia narrowband Pro filters can be useddownto F/3systemswith slight loss of signal
All AntliaNarrowband filters are edge blackened toeliminate internal reflectionsfrom stray light
Superior optical reliability reducespost image processing
This filter is not suited to deep sky objects that do not containH-alphaemissions.
Technical Specifications:
Basic Substrate:Schott optical substrate
Filter Thickness:2mm+/-0.05mm forDia36mm unmounted
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
Not Recommended:
Solar Observing and imaging
Visual observation
DO NOT LOOK AT THE SUN WITHANTLIAFILTERS.
Serious eye damage will result if youfail to observe the warning.
When we design filters for astronomy imaging systems, we look at how they will work together with optical systems, carefully designing the blocking and band-pass parameters to achieve an optimum result. The out of band blocking rate is a very important performance index since it is designed to sharply attenuate off-band wavelengths. The result is that the AntliaH-alpha3nm Profilter delivers excellent contrast with extremely dark backgrounds whilst delivering a high transmission of theH-alphasignal. Such filters are more difficult to produce to a consistently high standard.
Each filter is individually tested and scanned to ensure that the quality meets the high-performance parameters. The end result is a filter that achieves excellent contrast but with a higher production cost. We believe the price to performance ratio compares more favorably than similar premium filters in the market.
Due to Covid impacts, current stock and ongoing supplies will remain intermittent.
the spectrum of H-ALPHA 250-880nm
the spectrum of H-ALPHA 600-700nm
the spectrum of SII 250-880nm
the spectrum of SII 600-700nm
the spectrum of O3 250-880nm
the spectrum of O3 600-700nm
