Please use another browser such as Chrome, Edge, Firefox, or Safari for the best experience

Skip to content Askar FMA135 Sale
Skip to the end of the images gallery
Antlia OIII 4.5nm Edge Filter - 1.25
Skip to the beginning of the images gallery

Antlia OIII 4.5nm Edge Filter - 1.25"

Free shipping
SKU: ANT-OIII45E-125
$203.50
Ask an Expert
expert photo

Antlia OIII 4.5nm Edge Filter - Narrowband - 1.25"

The Antlia OIII EDGE narrowband filters optimize the FWHM (full width half maximum) to 4.5nm bandpass. The suppression of optical density (OD) 5 on unwanted wavelengths and the excellent transmittance characteristics found in the Antlia 3nm Pro series has been incorporated into the 4.5nm EDGE narrowband filters. The result is that these filters deliver superior SNR (signal to noise ratio) and better contrast in your images. Antlia OIII Edge filters are designed to deliver high transmittance at the 500.7nm line that provides you with the maximum signal to reveal the faintest OIII nebulae structures.

Conventional broader narrowband filters cause a heavy loss in transmission due to the strong Center Wavelength (CWL)-shift. We guarantee T>85% within 1nm range of the center bandwidth, which means that the OIII 4.5nm EDGE narrowband filters can guarantee high transmittance for working with both long focal ratios and fast optical systems. Blue-shift data shows that Antlia 4.5nm EDGE 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.

Antlia 4.5nm OIII Edge Filter Specifications

  • FWHM: 4.5nm
  • CWL: 500.7 nm
  • Peak Transmission: >85%
  • Blocking: 5 OD (0.001% out of band blocking) @ 300-1000nm
  • Filter Thickness: 2mm +/- 0.05 mm
  • Basic Substrate: Schott optical Substrate, single, non-glued
  • Surface Quality: S/D (scratch/dig)= 60/40 (Refer to MIL-O-13830)
  • Transmitted Wavefront: Lambda/4 or better
  • Parallelism: Less than 30 arcsec
  • Size: 1.25" Threaded

Antlia 4.5nm OIII EDGE Filter Features

  • 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: OIII 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
  • Antlia narrowband EDGE filters can be used down to f/3 systems with minimal loss of signal
  • All Antlia Narrowband filters are edge blackened to eliminate internal reflections from stray light
  • Superior optical reliability reduces post image processing
  • This filter is not suited to deep sky objects that do not contain OIII emissions.