We really struggled to combine RGB with Ha. For our first try at continuum subtraction however we are very pleased.

Equipment:

• Samyang 135mm f2.0 lens
• Fuji X-T5 (unmodified)
• Star Adventurer 2i
• STC duo narrowband filter

Images:

• 288x 60s RGB
• 592x 60s narrowband

Processing:

• stacked in Siril
• remove green noise
• background extraction
• star removal on both rgb and Ha
• continuum subtraction with Pixelmath in Siril
• adding Ha to RGB with Pixelmath
• BlurXTerminator
• NoiseXTerminator (0.5)
• GHST
• final editing and recomposition in Photoshop

Full resolution and more details: https://telescopius.com/pictures/view/202859/deep_sky/ngc-206/m31-andromeda/by-maxi_franzi