OriginStack sample session: Lagoon Nebula (M8), OIII session, narrowband emission nebula - 45 raw Celestron Origin frames

45 raw Celestron Origin light frames of Lagoon Nebula (M8), OIII session (narrowband emission nebula), 25 s each, captured 2026-08-25, with the session's own dark, flat and bias frames and the capture app's info.json. The Lagoon Nebula shot through an OIII (narrowband) filter. The FITS headers read FILTER = Nebula, the Origin's own label for the filter slot. Colour sensor (Origin178), 6-inch f/2.2 RASA, 3056×2048 Bayer FITS. Filter setting in the headers: Nebula (shot through an OIII filter). The frames are the best of the session by quality score, one from each of 45 consecutive time bins. The observer's location, GPS, airmass, session id and camera serial number were removed from the headers and json files; pixel data is unchanged. Capture time and the target's coordinates were kept. Stack it with OriginStack: python originstack.py -d "12_narrowband_OIII_Lagoon" -o stack.fits. With OriginStack 2.21: 42 of 45 frames accepted; median star width in the frames about 10.7 px. The file ending _expected_result.jpg is the preview that run produced. Zip: 503 MB, SHA-256 a02ad758ace4aea43ee4791cda05a2e999d2d3e0747a4048f03f0cc041c079e5.