Somebody knows, How to reduce (not eliminate) starspikes for newtonian telescope. Some brightness stars creates artifacts.
Starspikes reduction
The only way I’ve seen to do it ‘well’ is to extract the stars and process them separately from everything else, and be careful with the star processing as you obviously don’t want to bring out the star spikes much… You could, bring out the stars, duplicate the stars image, stretch one for the star intensity, and stretch the other for star spikes, then blend them together in photoshop or some other layer based editing software.. That would be fiddly, but it would probably yield the best results.
Helpful Concise
Alternatively you can 3d print masks for the spider vanes which can heavily reduce the diffraction spikes in the raw data, however this regularly results in nearly no diffraction spikes, so, its really a matter of ‘how bad do you dislike your spikes? if you want them gone, spider vane 3d printed masks, if you want them there, but heavily reduced, add steps to your processing to handle the stars..