MartinFransson Posted November 28, 2016 Share Posted November 28, 2016 Hi guys! Trying to stack a bunch of Ha-subs I got last night. I guess they are a bit faint but I have no problem seeing the stars in them. However, PI refuses to stack more than a few of the 39 subs. First I tried with BPP, but that didn´t work well. I used the calibrated and debayered images i StarAlignment and when I raised the Ransac tolerance and added some noise reduction I got it to register a few more but still not good. I get the error message: "*** Error: Unable to find an initial set of putative star pair matches" Any ideas? I use a Baader 12nm filter to capture them with my Canon 550D. Exposure 600 seconds at ISO 800 and f/5 scope. Had no problems stacking widefield images taken at f/4 but of course they were a bit brighter. Any general tips for stacking DSLR Ha images? One of the subs attached. IC405-HA-150PDS_LIGHT_600s_800iso_+6c_20161127-22h24m11s864ms.CR2 Link to comment Share on other sites More sharing options...
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