The stars did not come out at all.. Perhaps you need a shorter exposure if a reducer is used, perhaps the filter is too close to the sensor and needs to be moved further away, perhaps you need to additionally install a second IR-cut filter.. You need to check all options.
You can even increase the exposure time with a camera like that. Five minutes per frame is perfectly fine to shoot; there aren't any bright stars that could get blown out. What happened with the stars? Did you do a full resynthesis in Siril?
I usually shoot three-minute exposures, though five minutes is possible, but the final stacked result ends up about the same. However, losing a frame—whether it’s three minutes or five—makes a big difference.
There’s some strange issue with the stars—they all have large halos, even the faint ones. I didn’t want to create a synthetic star field; if the stars didn’t turn out well, it means I need to redo it. I’ve now also added an IR-cut filter into the reducer adapter—hopefully that helps.
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