From Wednesday night’s astro imaging session: Rosette Nebula in...

From Wednesday night’s astro imaging session: Rosette Nebula in Ha - Narrowband imaging is all about the filters you use to block out every bit of light except one narrow section of the electromagnetic spectrum. The photons landing at your telescope’s front door with the correct wavelength (around 656nm for hydrogen-alpha) are allowed to pass. Everyone else is kicked out. And sometimes with narrowband imaging you just want to go…narrower. Over the last ten years of astronomy and astrophotography I have used 12 nanometer, 7nm, and 6nm filters. (These numbers represent the gap in the filter, allowing light of a specific range of wavelengths through). See my first test with the Antlia 3nm Narrowband H-alpha Pro Filter on Youtube: https://youtu.be/UpaMgs0-h7A