Antlia 3nm SII Pro Series Filter - 2" - SII-PRO-3NM-2 (Pre-owned) Mounting Rings or a star cluster

or a star cluster

effectively making the sensation of looking through binoculars vanish

Increase your focus travel

and camera adapters

The included adapter bracket system is easy to install

Antlia 3nm SII Pro Series Filter - 2" - SII-PRO-3NM-2 (Pre-owned) Mounting Rings or a star clusterIn excellent condition. This very narrowband 3 nm SII filter from Antlia is part of their Pro series and comes in a 2" threaded filter cell that is designed to be screwed on to the 2" receptacle of your astrophotography accessory, including a 2" filter wheel or filter drawer. Antlia 3nm Pro Series Sulfur II Filter 2" Mounted This Antlia SII Pro narrowband filter optimizes the FWHM (full width half maximum) to a 3nm bandpass. As the bandwidth becomes