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Antlia ALP-T Dualband 3nm HA & OIII Filter - 2" - ALPT-DB-3NM-HAOIII-2 polar alignment About the Celestron 8-24mm ZoomThis ALP T, or Anti Light Pollution Filter, allows a 3nm narrowband transmission from both the OIII and H Alpha bands! This model comes in a 2" threaded filter cell, which allows it to be connected to the 2" threaded accessory of your choice, including a 2" filter wheel or filter holder. For f 4 or slower telescopes. Important! Do not use this filter for solar viewing or imaging! Antlia ALP T Dualband 3nm H Alpha & OIII Filter 2" This dual narrowband