ASI294MC Pro: Which filters have you used, liked, did not like & why? in Imaging - Deep Sky Posted 5 hours ago 5 minutes ago, vlaiv said: Many people now start to process starless version of their images (look up StarNet++ - software for removing stars from the image) and then put back in stars later on. In fact - I was going to suggest that as a way of processing nebula images with these UHC/Narrowband filters that alter color heavily. If you look at above example posted by @drjolo far right color checker has only two colors that are almost as they should be - red and teal which are colors of Ha and OIII (or close enough). This means that these filters don't need color correction when shooting nebulosity. They do change star color very much, but you can take some exposures without filter and then use StarNet++ to create starless version of image taken with filter and stars only version of image taken without filter and combine the two. That would give you proper color in both nebulosity and for stars. I see...that's interesting... There's nothing straightforward in this hobby..