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

counterweight

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

dual saddle mounts

This Celestron Labs Microscope has three (3) plan achromatic objective lenses

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