Antlia H-Alpha Edge Filter with 4.5 nm Band Width, 1.25" mounted

Antlia H-alpha (Ha) 4.5nm EDGE Narrowband Filter

Antlia H-alpha EDGE narrowband filters optimize the FWHM (full width half maximum) to 4.5 nm bandpass. The suppression of unwanted wavelengths (optical density OD5) and the excellent transmittance characteristics found in the Antlia 3 nm Pro series has been incorporated into the 4.5 nm EDGE narrowband filters. The result is that these filters deliver superior SNR (signal to noise ratio) and better contrast in your images.

Antlia H-alpha 4.5nm EDGE filters are designed to deliver high transmittance at the 656.3 nm line that provides you with the maximum signal to reveal the faintest H-alpha nebulae structures.

Conventional broader narrowband filters cause a heavy loss in transmission due to the strong center wavelength (CWL) shift. Antlia guarantees T>90% within 1 nm range of the center wavelength, which means that the H-alpha 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 meet the requirements of fast optics.

The quality features of this Antlia EDGE narrowband filter at a glance:

♦ High light transmission and narrow bandwidth to maximize contrast
♦ Steep spectral profile minimizes halos around bright stars
♦ Single substrate to eliminate internal reflections
♦ Narrowband objects: H-alpha emission nebulae, planetary nebulae, Wolf Rayet nebulae and supernova remnants
♦ Use in light-polluted areas and dark locations
♦ Extends exposure time in moonlight conditions
♦ Antlia narrowband EDGE filters can be used with low signal loss down to f/3 systems
♦ All unmounted Antlia narrowband filters are blackened at the edges to prevent internal reflections of stray light
♦ Superior optical reliability reduces post-processing of the image
♦ This filter only effective for deep sky objects that contain H-alpha emissions.

90% 5 OD out of band blocking @ 300-1000 nm