Antlia 3nm SII Pro Series Filter - 31 mm - SII-PRO-3NM-31 Askar 80ED Accessories especially when shutting down for

especially when shutting down for the night

Filter Type: Semi-APO

Whiter and brighter images are the benefit of the Everbrite mirror coating incorporated into the TeleVue 2" Everbrite Dielectric Diagonal

Sharp foreground objects stand out against a smooth blurred background

Includes encoders

Antlia 3nm SII Pro Series Filter - 31 mm - SII-PRO-3NM-31 Askar 80ED Accessories especially when shutting down forThis very narrowband 3 nm SII 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 Sulfur II Filter 31 mm Unmounted This Antlia SII Pro narrowband filter optimizes the FWHM (full width half maximum) to a 3nm bandpass. As the bandwidth becomes narrower, the 3nm Pro narrowband filters enhance contrast of emission targets