ANTLIA Narrowband 7nm SII Prime Filter - 36mm Unmounted (glass only)

ANTLIA Narrowband 7nm SII Prime Filter - 36mm Unmounted (glass only)

The Antlia SII Prime narrowband filter optimizes the FWHM (full width half maximum) to 7nm bandpass. The suppression of optical density is (OD)4 on unwanted wavelengths. The excellent optical coating characteristics found in the Antlia 3nm Pro series has been incorporated into the 7nm Prime narrowband filters. The result is that these filters deliver superior SNR(signal to noise ratio) and better contrast in your images. Antlia SII 7nm Prime filters are designed to deliver 90% transmission at the 671.6nm line that provides you with the maximum signal to reveal the faintest SII nebulae structures.

The out of band blocking specification is rated OD4 (0.01%) 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 7nm Prime filters are designed to minimize halos around bright stars. Antlia 7nm Prime filters can be used with nearly all systems as fast as f/2 with minimal loss in emission signal and meets the requirements of fast optics.

Application and Performance:

• 90% transmittance at Central Wavelength SII 671.6nm
• With wider FWHM, 7nm Prime narrowband filters can be used with fast optics of f/2 with minimal loss of signal
• Steep spectral profile minimizes halos around bright stars
• A single substrate to eliminate internal reflections
• Narrowband Objects: SII Emission Nebulae, Planetary, Wolf-Rayet Nebulae and Supernova Remnants
• Use in light polluted areas and dark sites
• All Antlia Narrowband filters are edge blackened to eliminate internal reflections from stray light
• Superior optical reliability reduces post image processing
• This filter is effective for deep sky objects that contain SII emissions

Technical Specifications:

• Basic Substrate: Optical, Single / Non-glued substrate
• Filter Thickness: 2mm+/-0.05mm for Dia36mm unmounted
• FWHM (Full width at half maximum): 7nm
• CWL (Central Wavelength): 671.6nm
• Peak Transmission: ＞90%
• Blocking: > 4OD(0.01% 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

Spectrum Curve:

Available Sizes：

Unmounted Dia36mm

Not Recommended:

• Solar imaging
• Night visual observation

Not Permitted:

DO NOT LOOK AT THE SUN WITH THIS FILTER
Serious eye damage will result if you fail to observe the warning