ANTLIA OIII 3nm PRO ULTRA NARROWBAND FILTER Solar This M81 extension tube has

This M81 extension tube has 25mm thickness

6" RMS with itnernal 25-stars model (REAL sky observations

your telescope’s optical axis will not be perfectly perpendicular to the declination axis

Does not include a tripod or Tri-Pier

Screw on connector ensures a secure

ANTLIA OIII 3nm PRO ULTRA NARROWBAND FILTER Solar This M81 extension tube hasThe new Antlia O III 3nm PRO ultra narrowband it is the latest filter produced by Antlia. This filter boosts the contrast of emission and planetary nebulae, Wolf Rayet nebulae and supernova remnants for professional results, even under a bright sky affected by light pollution. The 3. 0 nm band pass is only 1% of the entire visible spectrum, increasing the signal to noise ratio and delivering high contrast images and extremely dark backgrounds. To even