I just picked up a non-modified Canon 6D.
Below is a 1h 36m shot of the milky way, ISO 1600 with 120sec subs.
I’m using Siril to process the image.
Why are the H-alpha regions, Lagoon, Trifid and Omega nebulae showing up basically white? Why aren’t these more red?
I believe I have the color balance correct. I tried both “photometric color calibration” on M20 and or M8 and manual correction using a selection of blank sky. I also tried “remove green noise”
I understand that an astro-modified camera will improve the red response.
I’ve used the Arcsin stretch in Siril to preserve the colors while stretching so that isn’t it.
It is with a Canon 70-200mm at 200mm and f/2.8 with a B&W F-Pro protective filter.
The thoughput at H-Alpha on this filter is at least 95%