Information on tariffs affecting the amateur astronomy industry

Save up to 40% on select Sky-Watcher telescopes and gear!Save up to 40% on select Sky-Watcher telescopes and gear!
One week only: enjoy an extra 10% off Clearance & Open Box gear!One week only: enjoy an extra 10% off Clearance & Open Box gear!
Save 47% on the Askar V 6-in-1 Telescope While Supplies Last!Save 47% on the Askar V 6-in-1 Telescope While Supplies Last!
Shop All Black Friday & Holiday Sales at Agena Astro!Shop All Black Friday & Holiday Sales at Agena Astro!
Shop the brand new ZWO CAA electronic rotator and pre-order today!Shop the brand new ZWO CAA electronic rotator and pre-order today!
Shop the all new ZWO ASI585MC AIR and pre-order today!Shop the all new ZWO ASI585MC AIR and pre-order today!
Shop the all new ZWO EAF Pro and EAF-N telescope focusers today!Shop the all new ZWO EAF Pro and EAF-N telescope focusers today!
Save up to 25% on ZWO gear!Save up to 25% on ZWO gear!
Save up to $300 on ZWO AM5 and AM3 mount packages while supplies last! Save up to $300 on ZWO AM5 and AM3 mount packages while supplies last!

Optolong Oxygen III / O-III Narrowband (12nm) Nebula CCD Filter - 31mm Round Unmounted

$97.50
$130.00
Discontinued at Agena

This item has been discontinued by Agena and we no longer offer this.