Antlia 3nm H-Alpha Pro Series Filter - 2" - HA-PRO-3NM-2 carrying case 4 Waterproof: Yes Gas filled:

4 Waterproof: Yes Gas filled: Yes Warranty: 30 years Rubber Coated Body: Yes

75 and so therefore does not fit the 2" EFW electronic filter wheels

and an M42 adapter)

Built-in GPS

Blocking:  >OD4

Antlia 3nm H-Alpha Pro Series Filter - 2" - HA-PRO-3NM-2 carrying case 4 Waterproof: Yes Gas filled:This very narrowband 3 nm H alpha 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 holder. Important! Not for use when viewing or imaging the Sun! Antlia 3nm Pro Series H Alpha Filter 2" Mounted This Antlia H alpha Pro narrowband filter optimizes the FWHM (full width half maximum) to a