HA 3NM Filter Antlia Pro
The 3nm ha filter can be used in areas with a lot of light pollution to be able to obtain a very well contrasting image and perfectly centered in the wavelength of 656.3 Nm.
The narrow band width of Antlia has an extremely high transmission which allows you to have a higher contrast and simultaneously reduce the light pollution resulting from the emission of artificial lights of sodium and mercury.
The T is kept stable at 656.3 Nm with an 88%signal, where the filter becomes more sensitive to the spectrum in order to guarantee the best signal-outlet and an OD3 cutting frequency (0.1%) is necessary To reduce interference of other wavelengths.
The H-Alpha filter is generally used to photograph the emission nebulae, the planetary nebulae, can easily highlight the details of H-Alpha of these objects.
The pro version compared to the classic offers a 3nm bandwidth instead of 3.5 nm and is even more strict in its distribution of light on very bright objects.
Each filter is tested individually and scanned to ensure that quality responds to high performance parameters. The end result is a filter that reaches an excellent contrast, but with a higher production cost. We believe that the price ratio is more favorable than similar premium filters on the market.
Main use and performance
They work very well with the monochrome or colored CCD and CMOS rooms, CMOS rooms are recommended.
Suitable for deep imaging of emission nebulae, planetary nebulae and vestiges of supernos
Technical specifications:
- Basic substrate: Schott optical substrate
- Filter thickness: 3mm +/- 0.05mm for dighe50mm not mounted
- FWHM (total width in mid-maximum): 3nm
- CWL (central wavelength): 656.3NMNM
- Transmission point:> 88%
- Blocking:> 5 OD (0.001% band blocking) @ 300-1000NM
- Surface quality: S / D (Scratch / DIG) = 60/40 (see MIL-O-13830)
- Transmitted wave front: lambda / 4 or better.
- Parallelism: less than 30 arcsec
- Single / unlined substrate
