California Nebula(NGC 1499) - Telescope : William Optics RedCat 51 (f/4.9) - Corrector : none - Camera : Canon 6D (LPF removed) - Mount : Takahashi P2 - Guide Telescope : none - Guide Camera : none - Filter : STC Astro Duo narrowband filter - Exposure : 600s x 14 shot ~ 8400s(2.3 hrs), ISO1600 - Date/Time : 30. Sep. 2019 / 00:50 (MST)~ - Location : Mt. Lemmon Sky Center, Tucso..