I’ve been asked what filters I use for Solar imaging. I just use a sheet of Baader Solar film (grade 5.0) in a homemade filter holder – made from a piece of plastic ventilation pipe! I normally use just this filter. It is suitable for visual observing but I have a personal rule of never looking at the Sun with my eyes, safe filters or not! One silly mistake and the Sun will blind you. I only ever use a camera.
I do have a green filter but have found that I get just as good an image without it.