Optolong 3nm narrowband filters testimonial by Bai Le (China)

source:Bailepopularity:1924Release Time:2022-06-28

Optolong 3nm narrowband filters testimonial by Bai Le (China)


About the author: Bai Le

Author of the book <Starry Photography and Post-processing>

500px Certified We-Media Person


The Rosette Nebula

The Rosette Nebula (also known as Caldwell 49) is an H II region located near one end of a giant molecular cloud in the Monoceros region of the Milky Way Galaxy. The open cluster NGC 2244 (Caldwell 50) is closely associated with the nebulosity, the stars of the cluster having been formed from the nebula's matter.

The cluster and nebula lie at a distance of 5,000 light-years from Earth and measure roughly 130 light years in diameter. The radiation from the young stars excites the atoms in the nebula, causing them to emit radiation themselves producing the emission nebula we see. The mass of the nebula is estimated to be around 10,000 solar masses.

Technical Card

Location:Yunling Remote Observatory, Yunnan, China 云南云岭远程天文台

Telescope:Sky Rover 155APO PRO

Camera:ZWO ASI6200MM

Mount:Sky-Watcher EQ8-R

Filter:Optolong SHO 3nm


Ha 70*600s,SII 25*600s, OIII 25*600s total 20 hours

Credit: Bai Le, which in Chinese is 柏乐


Local scope one


Local scope two






M16, The Eagle Nebula

Telescope: SkyRover 155APO PRO

Camera: ZWO ASI6200MM

Mount: Sky Watcher EQ8-R

Filter: Optolong SHO 3nm narrowband filters

Total exposure: 15hours