Antlia 3nm OIII Pro Series Filter - 31 mm - OIII-PRO-3NM-31 StarField Newtonians All-metal precision internal construction makes

All-metal precision internal construction makes this mount strong and stable

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Antlia 3nm OIII Pro Series Filter - 31 mm - OIII-PRO-3NM-31 StarField Newtonians All-metal precision internal construction makesThis very narrowband 3 nm OIII filter from Antlia is part of their Pro series and is of the 31 mm unmounted variety. It is normally used in a 1. 25" 31mm filter wheel, where it drops into place. Antlia 3nm Pro Series Oxygen III Filter 31 mm The Antlia OIII Pro narrowband filter optimizes the FWHM (full width half maximum) to 3nm bandpass. As the bandwidth becomes narrower, the 3nm Pro narrowband filters enhance contrast of emission targets by lowering