ANTLIA 50mm 3nm Pro Astronomical Frameless Narrowband Filter for Deep Space Photography
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ANTLIA 50mm 3nm Pro Astronomical Frameless Narrowband Filter for Deep Space Photography
Description:
- 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. 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.
- 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 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 for 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.
- Narrowband Pro filters can be used down to F/3systemswith slight loss of signal.
- All Narrowband filters are edge blackened to eliminate internal reflections from stray light.
- Superior optical reliability reduces post image processing.
Technical Specifications:
- Basic substrate: Schott optical substrate
- Filter thickness: 3mm+/-0.05mm for Dia50mm 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) at 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
Package Included:
- 1 x Filter or Filter Set ( for option)
OIII 250-880nm:
OIII 600-700nm:
OIII 498-503nm:
OIII 250-880nm OD:
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