Antlia Oxygen III (OIII) 2.5nm Ultra Narrowband 2" Filter (ANT-25-OIII-2)

Antlia Oxygen III (OIII) 2.5nm Ultra Narrowband 2" Filter (ANT-25-OIII-2)The Antlia SHO 2. 5nm Ultra series filters are made with quartz glass and undergo precisely controlled coating processes to ensure optimal performance. The 2. 5nm Ultra series is designed with a FWHM (full width half maximum) of 2. 5nm +0. 3 0. 1nm and a transmission efficiency >92 95% at the Central Wavelength. The quartz glass possesses an ultra low thermal expansion coefficient with outstanding thermal and mechanical properties. When combined with

With ASI non-cooled cameras

Low profile design with only 65mm thickness (91mm with internal flange)

Wish the Askar FRA500 be a loyal companion alongside your journey of astrophotography

using a computerized telescope required a lengthy alignment process of finding and centering at least two bright stars in the telescope’s eyepiece

thus keeping a reflective rate at more than 96%

Length of male M54x0

it is not a mirror at all

it gets attached with four screws directly onto the filter housing (see illustration)

Step-up Rings (for cameras lenses with thread larger than M62): M62/M67 (#2968067)

interference patterns

Full Resolution: 6

co-editor of National Geographic Field Guide to the Birds of North America