Antlia 3nm SII Pro Series Filter - 31 mm - SII-PRO-3NM-31 Askar 80ED Accessories with their 82 degree apparent

with their 82 degree apparent field of view

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

Includes encoders

you will have to take a rest that your brain demands because it is simply overloaded by the extremely concentrated viewing

Antlia 3nm SII Pro Series Filter - 31 mm - SII-PRO-3NM-31 Askar 80ED Accessories with their 82 degree apparentThis 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