Messier 81 & Messier 82

• Photographer  : Hyunwoo Kim

• DATE  : 29 Jan 2022

• Place : Cheorwon (Bortle class 4)

• Telescope : SDT80 (FL 384mm/F4.8) 

• Tripod & Mount : AZ EQ6 GT

• Guide scope/camera : ZWO mini guide scope / ASI 120mm mini

• Camera : ASI1600mm pro (-20 deg)

• Filter : Optolong LRGBH

• Exposure : Total 5.03 hours 

Optolong L filter: 180s x 49 (gain 139)

Optolong R filter: 180s x 20 (gain 76)

Optolong G filter: 180s x 20 (gain 76)

Optolong B filter: 180s x 20 (gain 76)

Optolong Ha filter: 300s x 19 (gain 200)

• Software : Pixinsight