Antlia 3nm OIII Pro Series Filter - 2" - OIII-PRO-3NM-2 Baader Filters Focal Length: 30mm

Focal Length: 30mm

25" compression ring adapter so you can use both 1

Both barrels thread onto the diagonal housing

Counterweight and CW shaft

Don't let early morning dew stop you

Antlia 3nm OIII Pro Series Filter - 2" - OIII-PRO-3NM-2 Baader Filters Focal Length: 30mmThis very narrowband 3 nm OIII 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 Oxygen III Filter 2" Mounted The Antlia OIII Pro narrowband filter optimizes the FWHM (full width half maximum) to 3nm bandpass. As the bandwidth becomes narrower, the 3nm Pro