4.5nm Narrowband OIII EDGE Filter - 50mm Unmounted

The Antlia OIII 4.5nm EDGE filter is designed to deliver 85% transmission at the 500.7nm oxygen-III emission line, providing maximum signal to reveal the faintest OIII nebulae structures. This narrowband filter optimizes the FWHM (full width half maximum) to 4.5nm bandpass, with OD5 suppression of unwanted wavelengths and incorporates the excellent transmittance characteristics of the Antlia 3nm Pro series. These filters deliver superior signal-to-noise ratio (SNR) and better contrast in astrophotography images. The 4.5nm EDGE design ensures high transmittance for working with both long focal ratios and fast optical systems, from f/4 down to f/3 or faster.