A: The camera modification for astro photography aims to maximum H-alpha (Hα) 656nm recording. Camera modification for astro photography make the regular camera to High Ha sensing camera, it’s about 3 times more compared to unmodified digital cameras.
But the color of background will become so reddish, because the increased red light amount.
There are many ways of image processing to correct the reddish colors to natural colors.
Here are 2 simple ways.
A. Take the shots using Custom White Balance