Ostara O-iii narrowband nebula filter
Available in 1.25" or 2" filter size
Suitable for good quality telescopes 4" (100mm) and above
For the visual observations of Planetary and diffuse nebula only
Comes packaged in a foam lined plastic case to keep safe when not in use
Works great on Planetary nebula such as M57 (ring nebula), the dumbell and Eskimo
