Thank you! Yes, everything is working normally. I tried adjusting the back focus because something resembling astigmatism appears at the edges, but moving it closer or farther from the calculated 55mm didn't improve things, so I left it at the standard spacing. I kept this reducer from the 80mm Svbony.
I have an old (still blue) ED80 from Sky-Watcher and I'm puzzled about buying a reducer-flattener. The original one is no longer available, so I have to look for third-party options. SVBONY's price is more affordable. Thanks for the information.
As far as I understand, only the native lens can achieve the most beautiful results; everything else can be adapted to some extent, but with nuances regarding the stars.
I'm using the 503 102mm Svbony with the included extension tube, but there's no ring like for the 80mm. Still, it seems to do its job, though I'm just learning and don't have any decent shots yet.
26 Jul, 2025
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