It took me almost 2 months to collect enough data for this region. The weather in summer is often very bad and especially this year, there are several big typhoons and tropical depressions due to the influence of stronger El Nino.
The Ha data are impressive due to the rich hydrogen gas in the constellation Cygnus. However, the OIII data are much fainter, and it takes a lot of integration time to get the thin OIII filaments in the background. I think, the target is low relative to my latitude (it reaches a maximum altitude of only 63 degrees) and the sky is not dark enough (Bortle 6, SQM < 19) causing the image to have very low contrast when taken through OIII filter. Especially, I had to use the tone mapping workflow to deal with the StDr 139 nebula separately. Thanks to those who have delicately discovered this planetary nebula!
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