Astrobdlbug Posted February 9 Share Posted February 9 I considered what I could image over the past week as in my region of UK we were given several clear(ish) nights but had to contend with a full moon. Although I have imaged the rosette widefield with Samyang 135mm and also a closer FOV with 106mm Astrotec, I decided that the FOV using 90mm Stellamira + FF/FR and APS-C sensor with ASI2600MM would be interesting and would accomodate what can only be described as the frilly bits around the main bright nebula. What was surprising to me when I went to process I thought I had bad gradients and/or had not filtered out all subs that had clouds as the 'background' was very 'millky' when stretched with auto STF - however it turns out that it is real dust/gas nebulosity that surrounds the rosette, so there's not actually that much deep space background in this FOV I doubt if I will get the other channels captured / completed this season as the constellations move westwards I lose visibilty due to neighbouring trees. So a 'Study' in Ha will have to do for now... So this is a 10hr 40min integration using 128 300s subs and imaged through 3nm Antlia Ha filter with 90mm APO and 0.8x FR/FF and ASI2600MM I used Pixinsight to process including all the Rus Croman Xterminator tools and some Morphological Median transform and Local Hstogram Equalisation, stretching done with GHS. Bryan 5 1 Quote Link to comment Share on other sites More sharing options...
Sonyme Posted February 10 Share Posted February 10 Very nice Bryan. Superb detail. From this angle the Rosette looks pretty symmetrical making the gossamer like nebulosity to the left of the image particularly interesting. The funnel like structure toward the middle of the image and the stars it appears to contain adds loads of depth. What is fascinating is the stars in the centre of the image appear brighter than the stars in the surrounding starfield. Is this a natural phenomenon or the necessary manipulation of the image to add richness to the overall composition? Gary 1 Quote Link to comment Share on other sites More sharing options...
Astrobdlbug Posted February 10 Author Share Posted February 10 1 hour ago, Sonyme said: What is fascinating is the stars in the centre of the image appear brighter than the stars in the surrounding starfield. Gary, they are the stars that are in the open cluster designated ngc2244 and are very bright young stars - quick google and one is a K-class Giant and 400,000 brighter than our sun. So yes they’re much brighter - in previous images they always get bloated and difficult to contain when stretching an image before we had star removal tools. But now having BlurXT and StarXT makes the star layer much simpler to manage Bryan Quote Link to comment Share on other sites More sharing options...
MartinS Posted February 10 Share Posted February 10 Very nice Bryan, I will be looking out next year for the completed colour image. As you say it is far easier to cut out the stars for the main stretch and Nebulosity processing. When the opportunity presents I am hoping to capture an RGB starfield to merge with my Rosette data. 1 Quote Link to comment Share on other sites More sharing options...
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