Narayan Mukkavilli
Markarian's chain
ED80/ WO 0.8 reducer/Optolong L Pro/ZWO Asi 183mc
5 minutes x 18
everything that could possibly go wrong went wrong with this image. Firstly the object is too low, just barely clearing my roof, if not actually grazing it; secondly I got the spacing wrong -pure operator error so poor star shapes in the corners; thirdly I corrected the spacing without thinking that I hadn't taken flats so had to fall back on synthetic flats; fourthly synthetic flats can help reasonably with vignetting but are less effective with dust on sensor.
If today were not a cold wet rainy and miserable day I probably wouldn't have bothered processing the data at all.
Oh well
Markarian's chain
ED80/ WO 0.8 reducer/Optolong L Pro/ZWO Asi 183mc
5 minutes x 18
everything that could possibly go wrong went wrong with this image. Firstly the object is too low, just barely clearing my roof, if not actually grazing it; secondly I got the spacing wrong -pure operator error so poor star shapes in the corners; thirdly I corrected the spacing without thinking that I hadn't taken flats so had to fall back on synthetic flats; fourthly synthetic flats can help reasonably with vignetting but are less effective with dust on sensor.
If today were not a cold wet rainy and miserable day I probably wouldn't have bothered processing the data at all.
Oh well