Antlia 3nm SII Pro Series Filter - 31 mm - SII-PRO-3NM-31 Askar 80ED Accessories or pack it along in

or pack it along in your carry-on luggage without taking up much space

Filter Type: Semi-APO

Optical Design: Ritchey-Chretien Clear Aperture: 14" (355 mm) Focal Length: 2848 mm Focal Ratio: f/8 Focuser: 10:1 Crayford

especially when shutting down for the night

Sharp foreground objects stand out against a smooth blurred background

Antlia 3nm SII Pro Series Filter - 31 mm - SII-PRO-3NM-31 Askar 80ED Accessories or pack it along inThis 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