Antlia Filter 7nm Narrowband OIII Prime Filter - 36mm Unmounted

Antlia Filter 7nm Narrowband OIII Prime Filter - 36mm Unmounted

Antlia OIII 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 OIII 7nm Prime filters are designed to deliver 90% transmission at the 500.7nm line that provides you with the maximum signal to reveal the faintest OIII 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 OIII 500.7nm
• 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: OIII Emission Nebulae, Planetary, Wolf Rayet Nebulae and Supernova Remnants Use in light polluted areas and dark sites
• All Antlia unmounted 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 OIII 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): 500.7nm
• 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