Test imaging with Optolong narrowband filters of the Flame Nebula, Horsehead Nebula, and the star Alnitak.

Calibration: Dark, Bias, Flat, 31 frames each; Date: 23.01.2019 These filters produce strong halos around very bright stars (magnitude +2 and brighter), but I was very pleased with the test results! I didn’t expect the details to be this good, especially since only one out of four pixels is active on a color camera with this H-Alpha filter. Overall, the filters are good and will find their fans, and there aren’t that many nebulae with very bright stars—only a small portion of them... )) Preparing to switch to the Hubble Palette.